Massive Manhunt in Boston: One Terrorist Suspect Dead; One on the Loose

Editor's Note: We'll be following the latest updates from Boston.

Update (2:30 pm, ET): The FBI reports on its website: Dzhokar Tsarnaev may be driving a 1999 four-door, green Honda Civic with Massachusetts license plates reading 116GC7.

Update (1:10 pm, ET): At a news conference Friday afternoon, Massachussetts governor Deval Patrick said “there is a massive manhunt underway” for the suspects. He said all service on the MBTA has been suspended, and he urged people to stay inside. He said: "We're asking people to shelter in place, in other words to stay indoors with their doors locked and not to open the door for anyone other than a properly identified law enforcement officer. And that applies here in Watertown where we are right now, also Cambridge, Waltham, Newton, Belmont and at this point all of Boston, all of Boston."

Update (12:15 pm, ET): Ruslan Tsarni, an uncle of suspect Dzhokhar Tsarnaev, gave an impassioned plea for his nephew to surrender in an interview shown on NBC. He calld Dzhokhar and his deceased brother "losers" and described the family's grief for the victims and astonishment over events. In Boston, military helicopters have been deployed to track suspect who remains at large.

Update (11:54 am, ET): The name of the police officer killed Thursday night has been released: "Sean Collier, a campus security officer at M.I.T., had been shot while he sat in his police cruiser" (NYT blog). Collier did not participate in the firefight between the suspects and the police officers Thursday night. During that firefight, MBTA Transit Police Officer Richard H. Donahue Jr. was wounded. According to the Boston Globe, he is in stable condition at the hospital.

Update (11:19 am, ET): Second suspect still at large. Food and water is being brought in for Watertown residents in area where vehicular traffic is prohibited. Taxis are being allowed throughout Boston, though public transit remains halted. Reports of police running by media on Watertown street with guns drawn appearing on New York Times blog.

In the last several hours, Boston has erupted into violence and terror. The violence began late Thursday with the robbery of a 7/11 convenience store. A gun battle ensued in Cambridge with two suspects in the Boston Marathon bombing, according to the New York Times, which left one police officer dead. One suspect, Tamerlan Tsarnaev, 26, is also reported to have died following the shoot-out. His brother Dzhokhar Tsarnaev, 19, last seen wearing a white cap, remains at large and is considered armed and dangerous. The brothers are reported to be from the Chechen region of Russia, according to the Associated Press, but they have been living in the U.S. for at least a year. The father of the suspects spoke to the Associated Press today from Russia, describing his son on the loose as a "smart and accomplished young man."

A four-mile stretch of road is believe to be potentially littered with explosive devices thrown from the suspects' getaway vehicle.

Massachusetts Gov. Deval Patrick has told people to shelter in place in Boston and also in Watertown, Cambridge, Waltham, Newton, Belmont. SWAT teams, police, and heavily armored vehicles are gathering on Arsenal Street in Watertown. Public transit in Boston has been shut down, and airspace over the city is closed, though Logan airport remains open. Amtrak is termporarily suspended from Providence, R.I. to Boston.

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