One suspect was shot and later died at Beth Israel Hospital. He had bullet wounds and injuries from an explosion, according to officials. The second man apparently escaped on foot.
-- The slain suspect was wearing explosives and a triggering device when he died, a source briefed on the investigation told CNN's Deborah Feyerick. Several sources identified him as Tamerlan Tsarnaev, 26. He was the fugitive suspect's older brother.
-- Police swarmed over a Watertown, Massachusetts, neighborhood looking for the surviving suspect, identified by Boston police as Dzhokhar Tsarnaev, age 19.
-- Police ordered businesses in the suburb of Watertown and nearby communities to stay closed and told residents to stay inside and answer the door for no one but authorities. Boston authorities advised the same. The city's subway, bus and Amtrak train systems have been shut down. Taxi service across the city was suspended. Every Boston area school is closed.
The violence began late Thursday with the robbery of a 7/11 convenience store, according to Alben.
Soon after, in Cambridge, across the Charles River from Boston, a Massachusetts Institute of Technology police officer was fatally shot while he sat in his car, the Suffolk County District Attorney's Office said in statement. Police believe the bombing suspects were responsible for the shooting.
The two suspects, according to authorities, then hijacked a car at gunpoint in Cambridge. They released the driver a half-hour later at a gas station.
As police picked up the chase, the car's occupants threw explosives out the windows and shot at officers, according to the district attorney's office.
Officers fired back, wounding one of the men, possibly the person identified by the FBI as suspect No. 1, who is seen in the images released Thursday in a dark cap, sunglasses and wearing a black backpack.
The man died at Beth Israel Hospital. He had bullet wounds and injuries from an explosion, according to officials. The second man apparently escaped on foot
Richard H. Donohue Jr., 33, a three-year veteran of the transit system police force, was shot and wounded in the incident and taken to a hospital, a transit police spokesman said Friday. The officer's condition was not immediately known.(He has died since this was posted on CNN)
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