A massive manhunt is underway in and around Boston after a bloody confrontation with the men suspected of carrying out Monday's marathon bombing.
An M.I.T. police officer and one of the suspects are dead.
The other suspect remains at large, and the city is on lockdown.
SWAT officers went door to door clearing homes in the Boston suburb of Watertown, Massachusetts early Friday near the scene where one of the suspects was shot and killed.
Police confirm the two suspects wanted in the Boston Marathon bombing led them to Watertown.
Police say the pair were involved in an armed robbery in Cambridge, then shot and killed one M.I.T. police officer and wounded another.
"We believe this to be a terrorist we believe this a man who has come here to kill people, we need to get him in custody," said Boston Police Commissioner Edward Davis.
The Boston mass transit system has been shutdown, schools are closed and thousands of residents in several areas are being urged to stay in their homes.
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