Boston police are in an active manhunt for the surviving suspect that remains at large in the Boston Marathon bombings on Friday.

The two suspects, Chechen brothers 19-year-old Dzhokhar, and 26-year-old Tamerlan Tsarnaev were involved in a massive firefight with authorities last night after police were called to the scene of a robbery in Cambridge last night.

When police arrived, they found that a campus police officer from the massachusetts Institute of Technology had been fatally shot. It was reported that he suffered multiple gunshot wounds.

Authorities chased the two brothers who were in a stolen SUV as the brothers tossed explosive devices at the pursuing officers. The older brother, Tamerlan, was shot and killed in the shootout. The younger brother, Dzhokhar escaped the police.

The elder brother was taken to a local hospital with multiple gunshot wounds and was pronounced dead there.

The two brothers and their family emigrated to the U.S. from Turkey approximately ten years ago after fleeing the war-torn primarily muslim region of Chechnya.

Much of Watertown, a suburb of Boston, as well as Boston itself is locked down and residents are urged to stay indoors as a house to house search for the remaining suspect continues Friday. Public schools and Universities remain closed.

“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 in custody.”

The two brothers have been identified as two suspects responsible for the horrific terror attack at the finish line of the Boston Marathon.

The father of the two brothers, Anzor Tsarnaev, denies that the two were involved in the bombings. He has asked his son to give up peacefully but has warned that if Dzhokhor is killed “all hell will break loose.”