Here are some of the latest developments in the Boston Marathon bombing investigation:
-- "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 suspected Boston Marathon bombers,
-- 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, Massachusetts, 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 throw bombs out their windows -- and shootout that ended in nearby Watertown. "We're still investigating," Guyotte said.
-- 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.
-- FBI agents interviewed the mother as part of the investigation into Tamerlan Tsarnaev, whose case was closed after several months.
-- Tamerlan Tsarnaev's phone number was traced 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. The connection between Tamerlan Tsarnaev and the two other suspects was "twice removed," meaning he was in contact with people who had been in contact with the suspect, a U.S. government official said.
-- 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.
-- Thirty-four of the more than 260 people wounded in last week's explosions were still being treated Thursday evening in Boston-area hospitals, according to a CNN tally. Only one of them -- at Boston Medical Center -- is in critical condition. At least 14 people underwent amputations because of the blasts.
-- The mother of the Boston Marathon bombing suspects said Thursday that she'd called an ambulance to take her husband, Anzor Tsarnaev, to a hospital in the southern Russian city of Makhachkala. It was not immediately known whether Anzor Tsarnaev was ever admitted to a hospital and, if so, if he is still there.
-- Federal agents who swarmed the residence of University of Massachusetts-Dartmouth students on Friday "went in heavy" because they thought the surviving Boston Marathon bombings suspect, Dzhokhar Tsarnaev, might be inside, a federal law enforcement source told CNN.
-- 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 shot 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. "These guys are not being cut loose immediately, and there's a reason why," the federal law enforcement source said.
-- 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.
-- FBI Director Robert Mueller traveled to Boston on Thursday on a trip that was scheduled before the bombings, an FBI official said. He is also meeting with members of the field office who are working on the bombings case.
-- 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. Previously, Rep. Dutch Ruppersberger, a Maryland Democrat and member of the House Select Committee on Intelligence, said Tamerlan and Dzhokhar Tsarnaev used a remote control device similar to those used to control toy cars to detonate both bombs at the marathon.
-- A body found Tuesday is that of Sunil Tripathi, a missing Brown University student who was falsely identified by some on social media as being one of the Boston Marathon bombers. The Rhode Island State Medical Examiner's office said Thursday that the body has been identified as that of Tripathi, missing since March 15. No foul play is suspected in his death, the office said.
-- 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.