MIT police officer Sean Collier, 26, of Somerville, was killed in confrontation with Boston Marathon terror suspects Tamerlan Tsarnaev and Dzhokhar Tsarnaev on Thursday night, Boston Globe confirmed via Twitter on Friday.

The two bomb suspects connected to the Boston Marathon explosions on Monday are now revealed as two brothers from the area near Chechnya. The bombings killed three people and injured over 140.

At approximately 10:20 p.m. Thursday, police said the bombing suspects robbed a 7-Eleven store in Cambridge, Boston. The men then shot and killed MIT campus officer Collier responding to the robbery call, and carjacked a Mercedes-Benz with the driver inside and fled the scene. They eventually let the driver go free and in Watertown is where they got in a shootout with patrol officers.

Tamerlan, 26, was shot by police and brought to Beth Israel Medical Center as he was under cardiac arrest with multiple gunshot wounds. He ultimately died and his brother, 19-year-old Dzhokhar, fled the shootout. A manhunt for his is still underway.

"We believe this to be a terrorist," said Boston police Commissioner Ed Davis. "We believe this to be a man who has come here to kill people. We need to get him into custody."

"There is a terrorist on the loose," a law enforcement officer before dawn on Friday, according to NBC News.

Law enforcement officials also told NBC that the brothers entered the United States with family in 2002 or 2003. Tamerlan became a legal permanent resident in 2007. He moved from Chechnya to Kazakhstan to the U.S.

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