Story highlights
- Officials warned President Barack Obama of a possible terror threat targeting New York City, Los Angeles and Washington over the New Year's Eve holiday
- The threat was uncorroborated and was based on a single source.
(CNN)Federal and local security officials are tightening security in high-profile locations tied to New Year's celebrations, including New York's Times Square and the Rose Bowl festivities near Los Angeles.
Before President Barack Obama left for his Hawaii vacation he asked his top security officials for a briefing on security threats facing the nation over the year-end holidays.
Among the threats he was told of was one originating overseas warning of possible attacks in three major U.S. cities, New York, Los Angeles and Washington, between the Christmas and New Year holidays, according to senior U.S. officials briefed on the matter.
Wounded passengers are treated following a suicide bombing at the Brussels Airport on March 22, 2016. The attacks on the airport and a subway killed 32 people and wounded more than 300. ISIS claims its "fighters" launched the attacks in the Belgian capital.
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Syrians gather at the site of a double car bomb attack in the Al-Zahraa neighborhood of the Homs, Syria, on February 21, 2016. Multiple attacks in Homs and southern Damascus kill at least 122 and injure scores, according to the state-run SANA news agency. ISIS claimed responsibility.
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Syrian pro-government forces gather at the site of a deadly triple bombing Sunday, January 31, in the Damascus suburb of Sayeda Zeynab. ISIS claimed responsibility for the attack, according to a statement circulating online from supporters of the terrorist group.
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Yemenis check the scene of a car bomb attack Sunday, December 6, in Aden, Yemen. Aden Gov. Jaafar Saad and six bodyguards died in the attack, for which the terror group ISIS claimed responsibility.
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Investigators check the scene of a mosque attack Friday, November 27, in northern Bangladesh's Bogra district. ISIS has claimed responsibility for the attack that left at least one person dead and three more wounded.
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Wounded people are helped outside the Bataclan concert hall in Paris following a series of coordinated attacks in the city on Friday, November 13. The militant group ISIS claimed responsibility for the attacks, which killed at least 130 people and wounded hundreds more.
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Emergency personnel and civilians gather at the site of a twin suicide bombing in Beirut, Lebanon, on Thursday, November 12. The bombings killed at least 43 people and wounded more than 200 more. ISIS appeared to claim responsibility in a statement posted on social media.
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Smoke rises over the northern Iraqi town of Sinjar on November 12. Kurdish Iraqi fighters, backed by a U.S.-led air campaign, retook the strategic town, which ISIS militants overran last year. ISIS wants to create an Islamic state across Sunni areas of Iraq and Syria.
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Syrian government troops walk inside the Kweiras air base on Wednesday, November 11, after they broke a siege imposed by ISIS militants.
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Members of the Egyptian military approach the wreckage of a Russian passenger plane Sunday, November 1, in Hassana, Egypt. The plane crashed the day before, killing all 224 people on board. ISIS claimed responsibility for downing the plane, but the group's claim wasn't immediately verified.
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An explosion rocks Kobani, Syria, during a reported car bomb attack by ISIS militants on Tuesday, October 20.
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Shiite fighters, fighting alongside Iraqi government forces, fire a rocket at ISIS militants as they advance toward the center of Baiji, Iraq, on Monday, October 19.
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Smoke rises above a damaged building in Ramadi, Iraq, following a coalition airstrike against ISIS positions on Saturday, August 15.
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Iraqi men look at damage following a bomb explosion that targeted a vegetable market in Baghdad on Thursday, August 13. ISIS claimed responsibility for the attack.
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In this image taken from social media, an ISIS fighter holds the group's flag after the militant group overran the Syrian town of al-Qaryatayn on Thursday, August 6, the London-based Syrian Observatory for Human Rights reported. ISIS uses modern tools such as social media to promote reactionary politics and religious fundamentalism. Fighters are destroying holy sites and valuable antiquities even as their leaders propagate a return to the early days of Islam.
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An ISIS fighter poses with spoils purportedly taken after capturing the Syrian town of al-Qaryatayn.
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Smoke rises as Iraqi security forces bomb ISIS positions in the eastern suburbs of Ramadi, Iraq, on August 6.
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Buildings reduced to piles of debris can be seen in the eastern suburbs of Ramadi on August 6.
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The governor of the Asir region in Saudi Arabia, Prince Faisal bin Khaled bin Abdulaziz, left, visits a man who was wounded in a suicide bombing attack on a mosque in Abha, Saudi Arabia, on August 6. ISIS claimed responsibility for the explosion, which killed at least 13 people and injured nine others.
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Saudi officials and investigators check the inside of the mosque on August 6.
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Mourners in Gaziantep, Turkey, grieve over a coffin Tuesday, July 21, during a funeral ceremony for the victims of a suspected ISIS suicide bomb attack. That bombing killed at least 31 people in Suruc, a Turkish town that borders Syria. Turkish authorities blamed ISIS for the attack.
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Protesters in Istanbul carry anti-ISIS banners and flags to show support for victims of the Suruc suicide blast during a demonstration on Monday, July 20.
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People in Ashmoun, Egypt, carry the coffin for 1st Lt. Mohammed Ashraf, who was killed when the ISIS militant group attacked Egyptian military checkpoints on Wednesday, July 1. At least 17 soldiers were reportedly killed, and 30 were injured.
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Syrians wait near the Turkish border during clashes between ISIS and Kurdish armed groups in Kobani, Syria, on Thursday, June 25. The photo was taken in Sanliurfa, Turkey. ISIS militants disguised as Kurdish security forces infiltrated Kobani on Thursday and killed "many civilians," said a spokesman for the Kurds in Kobani.
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Residents examine a damaged mosque after an Iraqi Air Force bombing in the ISIS-seized city of Falluja, Iraq, on Sunday, May 31. At least six were killed and nine others wounded during the bombing.
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People search through debris after an explosion at a Shiite mosque in Qatif, Saudi Arabia, on Friday, May 22. ISIS claimed responsibility for the attack, according to tweets from ISIS supporters, which included a formal statement from ISIS detailing the operation.
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Iraqi soldiers fire their weapons toward ISIS group positions in the Garma district, west of the Iraqi capital of Baghdad, on Sunday, April 26. Pro-government forces said they had recently made advances on areas held by Islamist jihadists.
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A member of Afghanistan's security forces stands at the site where a suicide bomber on a motorbike blew himself up in front of the Kabul Bank in Jalalabad, Afghanistan, on Saturday, April 18. ISIS claimed responsibility for the attack. The explosion killed at least 33 people and injured more than 100 others, a public health spokesman said.
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Iraqi counterterrorism forces patrol in Ramadi on April 18.
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Thousands of Iraqis cross a bridge over the Euphrates River to Baghdad as they flee Ramadi on Friday, April 17.
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Yazidis embrace after being released by ISIS south of Kirkuk, Iraq, on Wednesday, April 8. ISIS released more than 200 Yazidis, a minority group whose members were killed, captured and displaced when the Islamist terror organization overtook their towns in northern Iraq last summer, officials said.
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Kurdish Peshmerga forces help Yazidis as they arrive at a medical center in Altun Kupri, Iraq, on April 8.
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A Yazidi woman mourns for the death of her husband and children by ISIS after being released south of Kirkuk on April 8. ISIS is known for killing dozens of people at a time and carrying out public executions, crucifixions and other acts.
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People in Tikrit inspect what used to be a palace of former President Saddam Hussein on April 3.
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On April 1, Shiite militiamen celebrate the retaking of Tikrit, which had been under ISIS control since June. The push into Tikrit came days after U.S.-led airstrikes targeted ISIS bases around the city.
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Iraqi security forces launch a rocket against ISIS positions in Tikrit on Monday, March 30.
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The parents of 19-year-old Mohammed Musallam react at the family's home in the East Jerusalem Jewish settlement of Neve Yaakov on Tuesday, March 10. ISIS released a video purportedly showing a young boy executing Musallam, an Israeli citizen of Palestinian descent who ISIS claimed infiltrated the group in Syria to spy for the Jewish state. Musallam's family told CNN that he had no ties with the Mossad, Israel's spy agency, and had, in fact, been recruited by ISIS.
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Iraqi Shiite fighters cover their ears as a rocket is launched during a clash with ISIS militants in the town of Al-Alam, Iraq, on Monday, March 9.
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Displaced Assyrian women who fled their homes due to ISIS attacks pray at a church on the outskirts of Damascus, Syria, on Sunday, March 1. ISIS militants abducted at least 220 Assyrians in Syria.
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Safi al-Kasasbeh, right, receives condolences from tribal leaders at his home village near Karak, Jordan, on Wednesday, February 4. Al-Kasasbeh's son, Jordanian pilot Moath al-Kasasbeh, was burned alive in a video that was recently released by ISIS militants. Jordan is one of a handful of Middle Eastern nations taking part in the U.S.-led military coalition against ISIS.
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A Kurdish marksman looks over a destroyed area of Kobani on Friday, January 30, after the city had been liberated from the ISIS militant group. The Syrian city, also known as Ayn al-Arab, had been under assault by ISIS since mid-September.
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Kurdish people celebrate in Suruc, Turkey, near the Turkish-Syrian border, after ISIS militants were expelled from Kobani on Tuesday, January 27.
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Collapsed buildings are seen in Kobani on January 27 after Kurdish forces took control of the town from ISIS.
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Junko Ishido, mother of Japanese journalist Kenji Goto, reacts during a news conference in Tokyo on Friday, January 23. ISIS would later kill Goto and another Japanese hostage, Haruna Yukawa.
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ISIS militants are seen through a rifle's scope during clashes with Peshmerga fighters in Mosul, Iraq, on Wednesday, January 21.
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An elderly Yazidi man arrives in Kirkuk after being released by ISIS on Saturday, January 17. The militant group released about 200 Yazidis who were held captive for five months in Iraq. Almost all of the freed prisoners were in poor health and bore signs of abuse and neglect, Kurdish officials said.
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Smoke billows behind an ISIS sign during an Iraqi military operation to regain control of the town of Sadiyah, about 95 kilometers (60 miles) north of Baghdad, on Tuesday, November 25.
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Fighters from the Free Syrian Army and the Kurdish People's Protection Units join forces to fight ISIS in Kobani on Wednesday, November 19.
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A picture taken from Turkey shows smoke rising after ISIS militants fired mortar shells toward an area controlled by Syrian Kurdish fighters near Kobani on Monday, November 3.
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Iraqi special forces search a house in Jurf al-Sakhar, Iraq, on Thursday, October 30, after retaking the area from ISIS.
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ISIS militants stand near the site of an airstrike near the Turkey-Syria border on Thursday, October 23. The United States and several Arab nations have been bombing ISIS targets in Syria to take out the militant group's ability to command, train and resupply its fighters.
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Kurdish fighters walk to positions as they combat ISIS forces in Kobani on Sunday, October 19.
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Heavy smoke rises in Kobani following an airstrike by the U.S.-led coalition on October 18.
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Cundi Minaz, a female Kurdish fighter, is buried in a cemetery in the southeastern Turkish town of Suruc on Tuesday, October 14. Minaz was reportedly killed during clashes with ISIS militants in nearby Kobani.
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Kiymet Ergun, a Syrian Kurd, celebrates in Mursitpinar, Turkey, after an airstrike by the U.S.-led coalition in Kobani on Monday, October 13.
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Alleged ISIS militants stand next to an ISIS flag atop a hill in Kobani on Monday, October 6.
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A Kurdish Peshmerga soldier who was wounded in a battle with ISIS is wheeled to the Zakho Emergency Hospital in Duhuk, Iraq, on Tuesday, September 30.
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Syrian Kurds wait near a border crossing in Suruc as they wait to return to their homes in Kobani on Sunday, September 28.
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A elderly man is carried after crossing the Syria-Turkey border near Suruc on Saturday, September 20.
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A Kurdish Peshmerga fighter launches mortar shells toward ISIS militants in Zumar, Iraq, on Monday, September 15.
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Kurdish Peshmerga fighters fire at ISIS militant positions from their position on the top of Mount Zardak, east of Mosul, Iraq, on Tuesday, September 9.
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Displaced Iraqis receive clothes from a charity at a refugee camp near Feeshkhabour, Iraq, on Tuesday, August 19.
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Aziza Hamid, a 15-year-old Iraqi girl, cries for her father while she and some other Yazidi people are flown to safety Monday, August 11, after a dramatic rescue operation at Iraq's Mount Sinjar. A CNN crew was on the flight, which took diapers, milk, water and food to the site where as many as 70,000 people were trapped by ISIS. But only a few of them were able to fly back on the helicopter with the Iraqi Air Force and Kurdish Peshmerga fighters.
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Thousands of Yazidis are escorted to safety by Kurdish Peshmerga forces and a People's Protection Unit in Mosul on Saturday, August 9.
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Thousands of Yazidi and Christian people flee Mosul on Wednesday, August 6, after the latest wave of ISIS advances.
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A Baiji oil refinery burns after an alleged ISIS attack in northern Selahaddin, Iraq, on Thursday, July 31.
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A Syrian rebel fighter lies on a stretcher at a makeshift hospital in Douma, Syria, on Wednesday, July 9. He was reportedly injured while fighting ISIS militants.
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Children stand next to a burnt vehicle during clashes between Iraqi security forces and ISIS militants in Mosul on Tuesday, June 10.
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The threat was uncorroborated and was based on a single source.
But in the wake of attacks in Paris, San Bernardino and elsewhere, the FBI is boosting the number of agents and staff in some of its 24-hour command centers around the country, including New York, Washington and Los Angeles. New York City says it will have 6,000 police near Times Square, the biggest such deployment ever. The threat doesn't mention any specific locations in the three cities. Officials say their areas of concern always focus on so-called soft targets, including large gatherings and mass transit.
In Los Angeles the top concern is the Rose Bowl parade and football game, a major draw on television and for residents and tourists in the region.
"Though we know of no intelligence that is both specific and credible at this time of a plot by terrorist organizations to attack the homeland, the reality is terrorist-inspired individuals have conducted, or attempted to conduct, attacks in the United States this year," a December 16 Department of Homeland Security bulletin says.
Police officers stand guard as they investigate a suspicious vehicle in Redlands, California, on Wednesday, December 2, after a mass shooting in nearby San Bernardino in which 14 people died and 21 were injured. The shooting took place at the Inland Regional Center, where employees with the county health department were attending a holiday event. The two shooters -- Syed Rizwan Farook and his wife, Tashfeen Malik -- were fatally shot in a gun battle with police hours after the initial incident. Farook worked for the county health department.
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A police officer places a marker along East San Bernardino Avenue, near where the shootout occurred.
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Law enforcement officers search a residential area for suspects who fled after the shooting.
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Police search for the suspects in San Bernardino.
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The residential area was not far from where the shooting occurred.
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Law enforcement officers search a neighborhood in San Bernardino.
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A police officer loads his weapon while pursuing suspects.
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A SWAT team mobilizes during the search.
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People pray on the San Bernardino Golf Course, across the street from where the shooting took place.
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Heavily armed law enforcement officers swarmed the area where the shooting occurred.
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People leave a community center after reuniting with friends and family in the aftermath of the shootings.
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A woman is comforted near the scene of the shooting.
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A police helicopter hovers around the Inland Regional Center.
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Luis Gutierrez gets emotional as he talks about his wife who works in the facility and saw a gunman, according to Los Angeles Times photographer Marcus Yam.
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Two women speak with a firefighter at a triage area near the scene.
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Police stand guard outside of the emergency room at the Loma Linda University Medical Center, where some of the victims were being treated.
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Police escort civilians away from the site of the shooting.
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People walk away from the scene. It is unclear how many people were at the facility at the time of the shooting.
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Police in SWAT gear secure the area.
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Two women embrace at a community center where family members were gathering to pick up people from the scene.
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People gather at the San Bernardino Golf Course.
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People talk to police at the golf course.
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A woman is wheeled away on a stretcher.
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People are moved away from the area by bus.
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Police and fire personnel are seen near the site of the shooting.
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A crowd gathers behind the police line.
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Ambulances pull out of a staging area near the Inland Regional Center.
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A SWAT vehicle carries police officers.
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SWAT teams and a bomb squad were working to clear the buildings where the shootings took place.
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The threat involving the three U.S. cities is among many that officials are tracking. Federal and local officials say they have to treat even uncorroborated threats seriously. Another earlier single-sourced threat in December didn't materialize. But what authorities worry more about are possible plots that they don't know of.
U.S. officials repeatedly said there were no known credible terror threats in recent months, including in the days before a husband and wife carried out a well-planned shooting attack on an office gathering in San Bernardino, California.
One senior U.S. official says the security concerns around the New Year rival those around the July 4 holiday, a period during which the FBI said it thwarted plots and made more than two dozen arrests, some on non-terrorism charges simply to get suspected jihadist sympathizers off the street.
The U.S. isn't alone in heightened security concerns. In recent days, authorities in Belgium and Turkey have said they foiled possible plots on New Year's celebrations.
And it comes at the end a year of with an unprecedented number of terror-related prosecutions and investigations in the U.S.
A forensic scientist works near a Paris cafe on Saturday, November 14, following a series of coordinated attacks in Paris the night before that killed scores of people. ISIS has claimed responsibility.
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Police are out in force November 14 near La Belle Equipe, one of the sites of the terror attacks.
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Forensic police search for evidence inside the Comptoir Voltaire cafe after the attacks.
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Shoes and a bloody shirt lie outside the Bataclan concert hall on November 14. Most of the fatalities occurred at the Bataclan in central Paris.
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Security forces evacuate people on Rue Oberkampf near the Bataclan concert hall early on November 14.
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Medics evacuate an injured woman on Boulevard des Filles du Calvaire near the Bataclan early on November 14.
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Police, firefighters and rescue workers secure the area near the Bataclan concert hall on November 14.
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A man with blood on his shirt talks on the phone on November 14. He is next to the Bataclan theater, where gunmen shot concertgoers and held hostages until police raided the building.
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Police officers patrol the area around Notre Dame cathedral in Paris on November 14.
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Police officers patrol Paris' Saint-German neighborhood on November 14.
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Victims of the shooting at the Bataclan concert venue in central Paris are evacuated to receive medical treatment on November 14.
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A woman is evacuated from the Bataclan theater early on November 14.
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Forensics are working in the street of Paris after the terrorist attack on Friday, November 13. The words "horror," "massacre" and "war" peppered the front pages of the country's newspapers, conveying the shell-shocked mood.
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Rescuers evacuate an injured person near the Stade de France, one of several sites of attacks November 13 in Paris. Thousands of fans were watching a soccer match between France and Germany when the attacks occurred.
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A survivor of the terrorist attack in the Bataclan is assisted following terror attacks, November 13. The violence at the Bataclan, which involved a hostage-taking, resulted in the highest number of casualties of all the attacks.
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Spectators invade the pitch of the Stade de France stadium after the international friendly soccer match between France and Germany in Saint-Denis.
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Spectators embrace each other as they stand on the playing field of the Stade de France stadium at the end of a soccer match between France and Germany in Saint-Denis, outside Paris, on November 13.
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A body, covered by a sheet, is seen on the sidewalk outside the Bataclan theater.
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Rescuers evacuate an injured person on Boulevard des Filles du Calvaire, close to the Bataclan concert hall in central Paris.
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Wounded people are evacuated outside the scene of a hostage situation at the Bataclan theater in Paris on November 13.
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A medic tends to a wounded man following the attacks near the Boulevard des Filles du Calvaire.
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A woman walks past police and firefighters in the Oberkampf area of Paris.
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A riot police officer stands by an ambulance near the Bataclan concert hall in central Paris.
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Wounded people are evacuated outside the Bataclan concert hall.
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Police secure the Stade de France in Saint-Denis, north of Paris, following explosions during the soccer match between France and Germany.
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A wounded man is evacuated from the Stade de France in Saint-Denis, outside Paris.
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Spectators gather on the field of the Stade de France after the attacks. Explosions were heard during the soccer match between France and Germany.
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French security forces rush in as people are evacuated in the area of Rue Bichat in the 10th District of Paris.
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People leave the Stade de France after explosions were heard near the stadium during a soccer match between France and Germany on Friday. Paris Deputy Mayor Patrick Klugman told CNN President Francois Hollande was at the match and was evacuated at halftime.
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Victims lay on the pavement outside a Paris restaurant.
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Rescue workers and medics tend to victims at the scene of one of the shootings, a restaurant in the 10th District. Attackers reportedly used AK-47 automatic weapons in separate attacks across Paris, and there were explosions at the Stade de France.
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French security forces move people in the area of Rue Bichat in the 10th District. A witness told BFMTV that firefighters were on the scene to treat the injured.
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Senior U.S. officials say the number of probes reflects the way ISIS has innovated terrorist threats. Instead of vetting recruits and carefully planning major attacks as al Qaeda and other groups have done, ISIS uses a diffuse-propaganda strategy to encourage its recruits to be self-starters.
FBI Director James Comey calls it "crowd-sourced terrorism."
Despite those concerns, Comey and other senior U.S. officials are wary of causing panic.
One senior counterterrorism official noted that the number of Americans killed by terrorists in the past year is fewer than 20.
"That's a bad weekend in Chicago," the official said, adding. "Let us worry about the terrorists; Americans should go do their celebrations. They should be vigilant, but they shouldn't let these threats keep them from leaving home and living their lives."
