After an intense manhunt that began with the shooting of an MIT officer on Thursday night and caused lockdowns across Boston, Cambridge and Watertown on Friday, officials say Dzokhar Tsarnaev, the second suspect in the Boston Marathon bombings, has been taken into police custody.

The Boston Police Department tweeted at 8:45 p.m.: "Suspect in custody. Officers sweeping the area. Stand by for further info."

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Police surrounded the Boston suburb of Watertown the two alleged suspects in the bombing engaged officers with gunfire and explosives in a residential neighborhood Thursday night. Police said Tamerlan Tsarnaev, who they believe was the man wearing a black hat in marathon surveillance photos released by the FBI  late Thursday, was killed in the exchange. His brother went on to elude police.