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Latest developments in the Boston bombing investigation

By CNN Staff
April 27, 2013 -- Updated 0224 GMT (1024 HKT)

(CNN) -- Here are some of the latest developments in the Boston Marathon bombing investigation:

-- The leads to search a New Bedford, Massachusetts, landfill for a laptop computer came from Boston Marathon bombing suspect Dzhokhar Tsarnaev as well as others who may have knowledge of the computer's whereabouts or may have played a role in disposing of it after the April 15 attack, a U.S. law enforcement official close the Boston investigation told CNN's Susan Candiotti.

-- There is evidence that leads investigators to believe that the other suspect, Dzhokhar's brother Tamerlan, may have been involved in drug dealing, the U.S. law enforcement official said. The source would not elaborate.

-- The Boston Celtics paid tribute Friday night to those affected, and those who took action, in last week's attack, including members of federal, state and local law enforcement agencies as well as staffers from city hospitals. It was the NBA team's first home game -- a playoff match-up with the New York Knicks -- since the bombings.

Previously reported:

-- Dzhokhar Tsarnaev was taken from Boston's Beth Israel Deaconess Medical Center at 3:30 a.m. Friday and transferred to Federal Medical Center Devens about 40 miles away, a law enforcement official said. Federal Medical Center Devens is a Federal Bureau of Prisons facility in north-central Massachusetts that holds detainees who need medical care.

-- The 19-year-old had improved enough in recent days that he has been able to sit and was writing, the official added.

-- Some 30 of the more than 260 people wounded in the April 15 attack remained hospitalized Friday afternoon, including one in critical condition, according to a CNN tally. Eight of those are at Beth Israel hospital.

-- The parents of the Boston Marathon bombing suspects have left their home in Dagestan for another part of Russia, the suspects' mother Zubeidat Tsarnaev told CNN Friday. She said the suspects' father, Anzor Tsarnaev, is delaying his trip to the United States indefinitely.

-- Anzor Tsarnaev, the father of the Boston Marathon bombing suspects, had agreed to fly to the United States to cooperate in the investigation. He was to take off as early as Friday, but Thursday his wife called an ambulance for him. He was not on an early Friday flight leaving Makhachkala, Dagestan, which serves as the first leg of travel to the United States.

-- "Members of the MIT community" are being asked -- at the request of the Massachusetts Institute of Technology's campus police chief and the Middlesex County district attorney's office -- to provide authorities with information related to the night of April 18, MIT administrator Israel Ruiz said in a letter posted on the school's website. Authorities have said they believe MIT police officer Sean Collier was killed that night by the suspects in the Boston Marathon bombing.

-- The Middlesex County District Attorney's Office hopes to bring charges against Dzhokhar Tsarnaev for his alleged role in incidents last week in Cambridge and Watertown, spokeswoman Stephanie Guyotte said Thursday. Authorities have said they suspect Dzhokhar Tsarnaev and his late brother, Tamerlan, killed Collier in Cambridge and later were involved in a chase -- during which they allegedly threw bombs out of their windows -- and shootout that ended in nearby Watertown. "We're still investigating," Guyotte said.

-- A man -- a 26-year-old Chinese entrepreneur identified only by his nickname, Danny -- tells the Boston Globe how he was carjacked by two men who, he said, confessed to the Boston attack and to killing a police officer in Cambridge, Massachusetts. The men also talked about going to New York, the man told the Globe.

-- One of the explosives found at last week's gunfight between police and the two Boston bombing suspects is similar to one outlined in terrorist group al Qaeda's online magazine, Inspire, a U.S. official told CNN. Both are made with a metal elbow pipe and wrapped in black tape, officials said. Investigators have been saying for some time that pipe-bomb designs are available on the Internet, though the U.S. official said it hasn't been determined definitively if the al Qaeda publication had anything to do with the bombs used in Massachusetts.

-- Russia raised concerns to U.S. authorities about Zubeidat Tsarnaev, the mother of the Boston Marathon bombings' suspects, in 2011 at the same time they asked the U.S. about her son Tamerlan, several sources told CNN.

-- Also, U.S. authorities added both the mother and son to the Terrorist Identities Datamart Environment, or TIDE, database -- a collection of more than a half million names maintained by the National Counterterrorism Center, an intelligence official said.

-- Russian President Vladimir Putin said that he wished authorities in his country could have done something more that might have prevented the Boston attack. "The Russian (authorities), to my great regret, were not able to provide our American colleagues with information that would have operative significance," he said Thursday.

-- Putin, Russia's president, urged closer cooperation with the United States on security issues in the wake of the Boston Marathon bombings. "This tragedy should motivate us to work closer together," Putin said during a live televised call-in session in Moscow on Thursday. "If we combine our efforts, we will not suffer blows like that."

-- Tamerlan Tsarnaev's phone number was seen as indirectly linked to numbers that came up in two other investigations into terror suspects, according to a senator who attended classified briefings about the Boston attack investigation.

-- Rep. Mike Rogers, R-Michigan, chairman of the House Intelligence Committee, said investigators believe the Boston bombing suspects were planning another attack "likely in the Boston area." "The notion they decided to go to New York was a rushed event after this thing unraveled on them," Rogers said.

-- Dzhokhar Tsarnaev shared a cell phone with a Russian-speaking student from Kazhakstan who was detained in the raid, something the law enforcement source said authorities had determined through cell phone records and their social media interaction. This other student was in a picture with Dzhokhar last year in New York's Time Square.

-- This student and another taken into custody in the raid continued to be detained Thursday. The young men, both foreign exchange students from Kazhakstan, are being held by federal authorities on alleged visa violations.

-- The two students, who haven't been identified by name, are not thought to be linked to last week's attack in Boston, sources stress. Yet investigators hope they can better piece together the suspected bombers' movements before and after the marathon.

-- Dzhokhar Tsarnaev revealed to investigators that he and his brother intended to drive to New York and "detonate additional explosives in Times Square," New York Mayor Michael Bloomberg said at a news conference Thursday afternoon. Bloomberg said the FBI told New York officials this information Wednesday night.

-- At least one of the two bombs used in Boston -- the second to explode -- was detonated by remote control, a law enforcement official told CNN on Thursday.

-- No firearm was found in the boat where the surviving Boston Marathon attack suspect, Dzhokhar Tsarnaev, was found, several sources from different agencies familiar with the investigation said Thursday. Authorities had said in a criminal complaint there was a standoff between the boat's occupant and police involving gunfire.

-- That boat was towed around 5:20 p.m. Friday from the Watertown, Massachusetts, backyard in which it had been located. Video from CNN affiliate WHDH showed a vehicle with flashing sirens towing the boat from the yard and out of the Boston suburb's neighborhood, with other police vehicles nearby.

Case raises questions about post 9/11 intelligence reforms

-- The suspect's mother said Thursday in Dagestan that U.S. officials "already told us they will not let us see Dzhokhar." Zubeidat Tsarnaev earlier said that she believed the bombings were staged and fake. But she also said she feels sorry for the victims and is resolute in her belief that her sons were not involved. Zubeidat Tsarnaev is wanted on 2012 felony charges of shoplifting and property damage in Massachusetts, according to court officials. It is unclear whether returning to the United States would lead to her arrest.

-- The body of Tamerlan Tsarnaev remains in the custody of the Massachusetts chief medical examiner, a spokesman for the medical examiner's office said. Terrel Harris also said the cause of death has yet to be determined.

-- The name of one Boston Marathon bombing suspect was included in U.S. law enforcement and counterterrorism databases, but he was not on any watch list that would have prevented him from flying or required additional screening when he left or entered the country, intelligence and law enforcement officials said.

-- The suspects received welfare benefits as children, the state government says; Tamerlan received them for his family through last year.

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