ISIS Fast FactsCNN LibraryUpdated 1923 GMT (0323 HKT) February 27, 2015The ISIS terror threat 50 photosIraqi army and volunteer fighters prepare in the Sedull Udeyim region of Iraq on Sunday, March 1, before an operation against ISIS in Tikrit, Iraq.Hide Caption 1 of 50The ISIS terror threat 50 photosDisplaced Assyrian women who fled their homes due to ISIS attacks pray at the Ibrahim Al-Khalil Melkite Greek Catholic Church on the outskirts of Damascus, Syria, on March 1. ISIS militants recently abducted at least 220 Assyrians in Syria. Hide Caption 2 of 50The ISIS terror threat 50 photosMembers of the Iraqi security forces leave Samarra, Iraq, north of Baghdad, on Saturday, February 28, to drive toward Tikrit to launch an assault against ISIS. Hide Caption 3 of 50The ISIS terror threat 50 photosA woman looks at her destroyed home after returning to the village of Al-Mansuriya, Iraq, on Saturday, February 14.Hide Caption 4 of 50The ISIS terror threat 50 photosSafi 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.Hide Caption 5 of 50The ISIS terror threat 50 photosA Kurdish marksman looks over a destroyed area of Kobani, Syria, on Friday, January 30, after the city had been liberated from the ISIS militant group. Kobani, also known as Ayn al-Arab, had been under assault by ISIS since mid-September.Hide Caption 6 of 50The ISIS terror threat 50 photosSmoke billows in Kirkuk, Iraq, as Kurdish Peshmerga fighters take position against ISIS militants on January 30. The aim of ISIS is to create an Islamic state across Sunni areas of Iraq and in Syria.Hide Caption 7 of 50The ISIS terror threat 50 photosKurdish people celebrate in Suruc, Turkey, near the Turkish-Syrian border, after ISIS militants were expelled from Kobani on Tuesday, January 27.Hide Caption 8 of 50The ISIS terror threat 50 photosCollapsed buildings are seen in Kobani on January 27 after Kurdish forces took control of the town from ISIS.Hide Caption 9 of 50The ISIS terror threat 50 photosJunko 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.Hide Caption 10 of 50The ISIS terror threat 50 photosISIS militants are seen through a rifle's scope during clashes with Peshmerga fighters in Mosul, Iraq, on Wednesday, January 21.Hide Caption 11 of 50The ISIS terror threat 50 photosAn 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.Hide Caption 12 of 50The ISIS terror threat 50 photosSmoke 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.Hide Caption 13 of 50The ISIS terror threat 50 photosFighters from the Free Syrian Army and the Kurdish People's Protection Units join forces to fight ISIS in Kobani on Wednesday, November 19.Hide Caption 14 of 50The ISIS terror threat 50 photosA 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.Hide Caption 15 of 50The ISIS terror threat 50 photosIraqi special forces search a house in Jurf al-Sakhar, Iraq, on Thursday, October 30, after retaking the area from ISIS.Hide Caption 16 of 50The ISIS terror threat 50 photosISIS 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.Hide Caption 17 of 50The ISIS terror threat 50 photosKurdish fighters walk to positions as they combat ISIS forces in Kobani on Sunday, October 19.Hide Caption 18 of 50The ISIS terror threat 50 photosA U.S. Air Force plane flies above Kobani on Saturday, October 18. Hide Caption 19 of 50The ISIS terror threat 50 photosHeavy smoke rises in Kobani following an airstrike by the U.S.-led coalition on October 18.Hide Caption 20 of 50The ISIS terror threat 50 photosCundi 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.Hide Caption 21 of 50The ISIS terror threat 50 photosTurkish police officers secure a basketball stadium in Suruc on October 14. Some Syrian Kurds were held there after crossing from Syria into Turkey. Tens of thousands of people fled Kobani to escape ISIS.Hide Caption 22 of 50The ISIS terror threat 50 photosKiymet Ergun, a Syrian Kurd, celebrates in Mursitpinar, Turkey, after an airstrike by the U.S.-led coalition in Kobani on Monday, October 13.Hide Caption 23 of 50The ISIS terror threat 50 photosAlleged ISIS militants stand next to an ISIS flag atop a hill in Kobani on Monday, October 6. Hide Caption 24 of 50The ISIS terror threat 50 photosIn this photo released by the U.S. Air Force on Saturday, October 4, a U.S. Navy jet is refueled in Iraqi airspace after conducting an airstrike against ISIS militants.Hide Caption 25 of 50The ISIS terror threat 50 photosA 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.Hide Caption 26 of 50The ISIS terror threat 50 photosSyrian Kurds wait near a border crossing in Suruc as they wait to return to their homes in Kobani on Sunday, September 28.Hide Caption 27 of 50The ISIS terror threat 50 photosTomahawk missiles, intended for ISIS targets in Syria, fly above the Persian Gulf after being fired by the USS Philippine Sea in this image released by the U.S. Navy on Tuesday, September 23.Hide Caption 28 of 50The ISIS terror threat 50 photosTurkish Kurds clash with Turkish security forces during a protest near Suruc on Monday, September 22. According to Time magazine, the protests were over Turkey's temporary decision to close the border with Syria.Hide Caption 29 of 50The ISIS terror threat 50 photosSyrian Kurds fleeing ISIS militants wait behind a fence in Suruc on Sunday, September 21.Hide Caption 30 of 50The ISIS terror threat 50 photosA elderly man is carried after crossing the Syria-Turkey border near Suruc on Saturday, September 20.Hide Caption 31 of 50The ISIS terror threat 50 photosA Kurdish Peshmerga fighter launches mortar shells toward ISIS militants in Zumar, Iraq, on Monday, September 15.Hide Caption 32 of 50The ISIS terror threat 50 photosKurdish Peshmerga fighters fire at ISIS militant positions from their position on the top of Mount Zardak, east of Mosul, Iraq, on Tuesday, September 9. Hide Caption 33 of 50The ISIS terror threat 50 photosIraqi volunteer fighters celebrate breaking the Amerli siege on Monday, September 1. ISIS militants had surrounded Amerli, 70 miles north of Baquba, Iraq, since mid-June.Hide Caption 34 of 50The ISIS terror threat 50 photosKurdish Peshmerga forces stand guard at their position in the Omar Khaled village west of Mosul on Sunday, August 24. Hide Caption 35 of 50The ISIS terror threat 50 photosKurdish Peshmergas fight to regain control of the town of Celavle, in Iraq's Diyala province, on August 24.Hide Caption 36 of 50The ISIS terror threat 50 photosPeshmerga fighters stand guard at Mosul Dam in northern Iraq on Thursday, August 21. With the help of U.S. military airstrikes, Kurdish and Iraqi forces retook the dam from ISIS militants on August 18. A breach of the dam would have been catastrophic for millions of Iraqis who live downstream from it.Hide Caption 37 of 50The ISIS terror threat 50 photosDisplaced Iraqis receive clothes from a charity at a refugee camp near Feeshkhabour, Iraq, on Tuesday, August 19.Hide Caption 38 of 50The ISIS terror threat 50 photosPeshmerga fighters inspect the remains of a car that reportedly belonged to ISIS militants and was targeted by a U.S. airstrike in the village of Baqufa, north of Mosul, on August 18.Hide Caption 39 of 50The ISIS terror threat 50 photosKurdish Peshmerga fighters fire at ISIS in Khazair, Iraq, on Thursday, August 14. Hide Caption 40 of 50The ISIS terror threat 50 photosAziza 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.Hide Caption 41 of 50The ISIS terror threat 50 photosThousands of Yazidis are escorted to safety by Kurdish Peshmerga forces and a People's Protection Unit in Mosul on Saturday, August 9.Hide Caption 42 of 50The ISIS terror threat 50 photosThousands of Yazidi and Christian people flee Mosul on Wednesday, August 6, after the latest wave of ISIS advances.Hide Caption 43 of 50The ISIS terror threat 50 photosA Baiji oil refinery burns after an alleged ISIS attack in northern Selahaddin, Iraq, on Thursday, July 31.Hide Caption 44 of 50The ISIS terror threat 50 photosA 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.Hide Caption 45 of 50The ISIS terror threat 50 photosPeshmerga fighters clean their weapons at a base in Tuz Khormato on June 25.Hide Caption 46 of 50The ISIS terror threat 50 photosNew army recruits gather in Najaf, Iraq, on Wednesday, June 18, following a call for Iraqis to take up arms against Islamic militant fighters. Hide Caption 47 of 50The ISIS terror threat 50 photosKurdish Peshmerga forces, along with Iraqi special forces, deploy their troops and armored vehicles outside of Kirkuk, Iraq, on June 12.Hide Caption 48 of 50The ISIS terror threat 50 photosChildren stand next to a burnt vehicle during clashes between Iraqi security forces and ISIS militants in Mosul on Tuesday, June 10.Hide Caption 49 of 50The ISIS terror threat 50 photosCivilians from Mosul escape to a refugee camp near Irbil, Iraq, on June 10. Hide Caption 50 of 50 (CNN)Here's a look at Islamic State in Iraq and Syria (ISIS).Facts:Started as an al Qaeda splinter group. Also known as Islamic State in Iraq and the Levant (ISIL) and Islamic State (IS).The aim of ISIS is to create an Islamic state, referred to as a caliphate, across Sunni areas of Iraq and in Syria.ISIS is known for killing dozens of people at a time and carrying out public executions, crucifixions and other acts. It has taken over large swaths of northern and western Iraq.The group currently controls hundreds of square miles. It ignores international borders and has a presence from Syria's Mediterranean coast to south of Baghdad. It rules by Sharia law.Dabiq, Syria "is where the Prophet Mohammed is supposed to have predicted that the armies of Islam and 'Rome' would meet for the final battle that will precede the end of time and the triumph of true Islam," according to CNN National Security Analyst Peter Bergen. ISIS's strategy for revenue includes oil production and smuggling, ransoms from kidnappings, selling stolen artifacts, extortion and controlling crops. Unable to serve under the new Iraq government after Saddam Hussein's military was disbanded, former Iraqi soldiers became ISIS fighters, according to Middle East expert Fawaz Gerges.Leader:Abu Bakr al-Baghdadi: Very little is known about al-Baghdadi, but a biography posted on jihadist websites in 2013 said he earned a doctorate in Islamic studies from a university in Baghdad.He formed the militant group in Salaheddin and Diyala provinces north of the Iraqi capital before joining al Qaeda in Iraq.Al-Baghdadi was detained for four years in Camp Bucca, which was a U.S.-run prison in southern Iraq. He was released in 2009.After ISIS declared the creation of the so-called "Islamic State," he began using the name Al-Khalifah Ibrahim, and now goes by that name with his followers.Timeline:2004 - Abu Musab al-Zarqawi establishes al Qaeda in Iraq (AQI).2006 - Under al-Zarqawi, al Qaeda in Iraq tries to ignite a sectarian war against the majority Shia community.June 7, 2006 - Al-Zarqawi is killed in a U.S. strike. Abu Ayyub al-Masri, also known as Abu Hamza al-Muhajer, takes his place as leader of AQI. October 2006 - AQI leader Abu Ayyub al-Masri announces the creation of Islamic State in Iraq (ISI), and establishes Abu Omar al-Baghdadi as its leader. April 2010 - Abu Bakr al-Baghdadi becomes leader of ISI after Abu Omar al-Baghdadi and Abu Ayyub al-Masri are killed in a joint U.S.-Iraqi operation.April 8, 2013 - ISI declares its absorption of an al Qaeda-backed militant group in Syria, Jabhat al-Nusra, also known as the al-Nusra Front. Al-Baghdadi says that his group will now be known as Islamic State in Iraq and the Levant (ISIS). April 2013 - Al-Nusra Front leader Abu Mohammed al-Jawlani rejects ISIS's attempt to merge with the group. February 3, 2014 - Al Qaeda renounces ties to ISIS after months of infighting between al-Nusra Front and ISIS.May 2014 - ISIS kidnaps more than 140 Kurdish schoolboys in Syria, forcing them to take lessons in radical Islamic theology. June 9, 2014 - Monday night into Tuesday, militants seize Mosul's airport, its TV stations and the governor's office. ISIS frees up to 1,000 prisoners.June 10, 2014 - ISIS takes control of Mosul.June 11, 2014 - ISIS takes control of Tikrit.June 21, 2014 - ISIS takes control of Al-Qaim, a town on the border with Syria, as well as three other Iraqi towns.June 28, 2014 - Iraqi Kurdistan restricts border crossings into the region for refugees fleeing the fighting.June 29, 2014 - ISIS announces the creation of a caliphate (Islamic state) that erases all state borders, making al-Baghdadi the self-declared authority over the world's estimated 1.5 billion Muslims. The group also announces a name change to the Islamic State (IS).June 30, 2014 - The United Nations announces that an estimated 1.2 million Iraqis have been forced from their homes.June 30, 2014 - The Pentagon announces the United States is sending an additional 300 troops to Iraq, bringing the total U.S. forces in Iraq to nearly 800. Troops and military advisers sent to Iraq are there to add security to the U.S. Embassy and the airport in Baghdad, and to provide support to Iraqi security forces.July 2014 - In Syria, all the cities between Deir Ezzor city and the Iraq border have fallen to ISIS, says Omar Abu Leila, a spokesman for the rebel Free Syrian Army.July 3, 2014 - ISIS takes control of a major Syrian oil field, al-Omar. It is the country's largest oil field and can produce 75,000 barrels of oil daily.July 17, 2014 - In Syria's Homs province, ISIS claims to have killed 270 people after storming and seizing the Shaer gas field.July 24, 2014 - ISIS militants blow up Jonah's tomb, a holy site in Mosul.August 8, 2014 - Two U.S. F/A-18 jet fighters bomb artillery of Sunni Islamic extremists in Iraq. President Barack Obama has authorized "targeted airstrikes" if needed to protect U.S. personnel from fighters with ISIS. The U.S. military also could use airstrikes to prevent what officials warn could be a genocide of minority groups by the ISIS fighters.August 19, 2014 - In a video posted on YouTube, U.S. journalist James Foley, missing in Syria since 2012, is decapitated by ISIS militants. The militants then threaten the life of another captured U.S. journalist, believed to be Steven Sotloff.September 2, 2014 - ISIS releases a video showing the beheading of U.S. journalist Steven Sotloff. Sotloff's apparent executioner speaks in what sounds like the same British accent as the man who purportedly killed Foley. He's dressed identically in both videos, head to toe in black, with a face mask and combat boots. He appears to be of similar build and height. He waves a knife in his left hand, as did the militant in the video of Foley's death.September 11, 2014 - The CIA announces that the number of people fighting for ISIS may be more than three times the previous estimates. Analysts and U.S. officials initially estimated there were as many as 10,000 fighters, but now ISIS can "muster between 20,000 and 31,500 fighters across Iraq and Syria," a CIA spokesman tells CNN.September 13, 2014 - ISIS militants post video on a website associated with the group, showing the apparent execution of British aid worker David Haines. This makes him the third Western captive to be killed by the Islamist extremist group in recent weeks. ISIS directs a statement at British Prime Minister David Cameron, threatening more destruction if Britain continues its "evil alliance with America." At the end of the video, the executioner threatens the life of Alan Henning, another British citizen held captive. The executioner appears to be the same one who killed both Steven Sotloff and James Foley.September 23, 2014 - The United States carries out airstrikes against ISIS. The bombing is focused on the ISIS stronghold of Raqqa, a city in northern Syria. October 3, 2014 - ISIS releases a video showing the apparent beheading of hostage Alan Henning. It blames the killing on the UK for joining the U.S.-led bombing campaign against ISIS in Iraq and Syria. In the same video, the group threatens the life of American aid worker Peter Kassig, also known as Abdul-Rahman Kassig.November 3, 2014 - The Iraqi government announces ISIS militants have killed 322 members of the Albu Minr tribe in a recent series of executions. According to Sheikh Nabil Al-Ga'oud, a leader in the Albu Minr tribe, the latest of these incidents occurred November 1, in which 75 members of the tribe were killed near the town of Hit. November 13, 2014 - An ISIS social media account posts an audio message purportedly recorded by leader Abu Bakr al-Baghdadi. The speaker is heard saying the U.S.-led coalition to destroy ISIS is "terrified, weak and powerless." The 17-minute audio says the coalition's effort has been a "failure" and the coalition will be "forced" to "send ground forces to their deaths and destruction." The speaker also urges Islamic State fighters to take their battle everywhere and "light the Earth with fire upon all tyrants," and mentions U.S. President Barack Obama's plan to deploy 1,500 additional U.S. troops to Iraq "under the claim they are advisers." CNN cannot confirm the authenticity of the online message or when it was recorded.November 14, 2014 - The U.N. Independent International Commission of Inquiry on Syria concludes that ISIS has committed war crimes and crimes against humanity, and leaders of the militant group should be held accountable by organizations such as the International Criminal Court.November 16, 2014 - ISIS militants claim to have beheaded American hostage Peter Kassig in a video published to the Internet. Peter Kassig, also known as Abdul-Rahman Kassig, is the fifth Westerner whom ISIS claims to have beheaded via video messages. The masked executioner, referred to as Jihadi John, states,"We bury the first crusader in Dabiq, eagerly waiting for the rest of your armies to arrive."January 20, 2015 - ISIS demands $200 million from Japan in exchange for the lives of two Japanese hostages, Kenji Goto and Haruna Yukawa. January 22, 2015 - U.S. diplomatic officials say that coalition airstrikes have killed thousands of ISIS fighters to date, including half of the top command of the terror group. The number may be as high as 6,000 or higher, according to U.S. ambassador to Iraq Stuart Jones. January 24, 2015 - Posted online is a video of hostage Kenji Goto, holding a photo of beheaded hostage Haruna Yukawa. A voice in the video demands the release of terror suspect Sajida al-Rishawi, from Jordan, in exchange for Kenji Goto. January 31, 2015 - ISIS releases a video online showing the decapitated body of journalist Kenji Goto.February 3, 2015 - Video and still images posted online by ISIS supporters apparently show Jordanian military pilot Moath al-Kasasbeh being burned alive while confined in a cage. Jordanian state TV says that al-Kaseasbeh was killed on January 3.February 5, 2015 - Jordanian fighter jets carry out airstrikes over Syria, reportedly hitting ISIS training centers and arms and ammunition depots in ISIS's de facto capital, Raqqa. Foreign Minister Nasser Judeh claims the airstrikes are just the beginning of Jordan's retaliation over the murder of Moath al-Kasasbeh.February 6, 2015 - In an online post, ISIS claims that Jordanian airstrikes killed American hostage Kayla Jean Mueller. The post contains a picture of a collapsed building, which ISIS claims Mueller was buried beneath. There is no proof of her death. Jordanian Interior Minister Hussein Majali calls the online post a "PR stunt." The Pentagon estimates ISIS has about 20,000 to 30,000 fighters. February 10, 2015 - Kayla Mueller's family announces she is dead, after receiving confirmation from ISIS, including a photo of her wrapped in a burial shroud. February 11, 2015 - U.S. President Barack Obama asks Congress to formally authorize use of military force against ISIS. February 15, 2015 - In a new propaganda video released by ISIS, the group appears to behead 21 Egyptian Christians on a Libyan beach. On February 16th, Egyptian warplanes stage airstrikes against ISIS targets in Libya in retaliation.February 20, 2015 - Three simultaneous suicide car bomb blasts kill at least 30 and injure more than 40 in Gobba, Libya. Wilayat al-Barqa, the Libyan branch of ISIS, claims responsibility for the explosions. February 22, 2015 - ISIS releases a new propaganda video, which appears to show at least 21 Kurdish Peshmerga fighters in cages paraded down Iraqi streets. The last scene of the video shows them alive, but a man threatens, "We say to the Peshmerga: Leave your jobs or your fate will be like these, either the cage or under the ground."February 26, 2015 - "Jihadi John," the disguised man with a British accent who appears in ISIS videos as the executioner of Western hostages, has been identified as Mohammed Emwazi, a Kuwaiti-born Londoner. More from World'Maternity hotels' raided in CaliforniaPositive signs in Ebola fight, but still no victoryFather: No proof my son is 'Jihadi John'