Suspect in MIT officer shooting is dead; Marathon bomb suspect loose

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Massachusetts Police say one of two suspects in the fatal shooting of an MIT campus officer is dead, and the other is loose somewhere in suburban Boston. The two have been tied to the Boston Marathon bombing by surveillance pictures. 

Police have named the man identified as Suspect #2. He's Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.

A district attorney says the other suspect died at hospital after a shootout with police.

Police say the Boston bomb suspects are from the Russian region near Chechnya, and have lived in US for at least a year.

Authorities urged residents in Watertown, Newton, Waltham, Belmont, Cambridge and the Allston-Brighton neighborhoods of Boston to stay indoors. All mass transit was shut down.

The announcement Friday morning comes hours after the killing one suspect, known as the man in the black hat from marathon surveillance footage. The man in the white hat is on the loose and police are calling him a "terrorist" who came here "to kill."

Tsarnaev also matches surveillance video of one of the two men suspected of robbing a 7-11 in Cambridge Thursday night. In the 7-11, Tsarnaev was seen wearing a grey hoodie. Along the Marathon route before and after the explosions, he was seen wearing a white hat, according to police.

The shooting of the campus officer at MIT Thursday night was followed by reports of violence in nearby Watertown, about 10 miles west of Boston. 

Residents of Watertown have been advised to keep their doors locked and not let anyone in.  Police have shut down all mass transit in the area while they search for the second suspect.

The Middlesex district attorney says the two men are suspected of killing an MIT police officer at the college late Thursday, then stealing a car at gunpoint and later releasing its driver unharmed.

Authorities say a campus police officer at the Massachusetts Institute of Technology died from injuries in a shooting on the campus in Cambridge, outside Boston.

Cambridge police and the Middlesex District Attorney's office says the officer was responding to a report of a disturbance when he was shot multiple times. He later died at a hospital. His name was not immediately released.
State Police spokesman Dave Procopio says the shooting took place about 10:30 p.m. outside an MIT building.

There are no other victims.
About 11,000 people attend the prestigious school.
The campus website said police were sweeping the campus and urged people to stay indoors until issuing an all-clear at 1:56 a.m.

A Massachusetts Transit officer was also shot, and is in critical condition.

Police believe the suspects threw explosives from the car as police followed it into Watertown. The suspects and police exchanged gunfire and one of the suspects was critically injured and later died.

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