Authorities say one of two suspects in the Boston Marathon bombing is dead and a massive manhunt is under way for the other, who has been identified as 19-year-old Dzhokhar A. Tsarnaev. Boston is effectively shut down in the meantime: Residents of Boston, Watertown, Newton, Waltham, Belmont, Cambridge, and the Allston-Brighton neighborhoods of Boston were told to remain in their homes; mass transit has been halted; businesses were asked not to open; and the Boston Globe reports that at least 16 area colleges have canceled classes. What we know of what happened overnight, per the AP and the Washington Post:
- The Middlesex district attorney says the two men are suspected of killing an MIT police officer at the college last night after the officer responded to a disturbance, then stealing a car at gunpoint and later releasing its driver unharmed. (All just hours after police released photos of the bombing suspects.)
- Authorities say the suspects threw explosives from the car as police followed it into Watertown; witnesses reported hearing multiple gunshots and explosions at about 1am. A transit police officer was critically wounded.
- The suspects and police exchanged gunfire and one of the suspects was critically injured and later died at a hospital while the other escaped.
- Doctors at Boston's Beth Israel Deaconess Medical Center say they treated a man with a possible blast injury and multiple gunshot wounds. They wouldn't confirm that the patient, who came in with police, was the suspect in the black hat from marathon surveillance footage.
- Police say the suspect on loose is a "terrorist" who "came here to kill people."
- Governor Deval Patrick held a press conference with police this morning extending the shelter-in-place warning to all of Boston. "There is a massive manhunt underway," he assured reporters. "We've got every asset that we can possibly muster on the ground right now."
- Authorities have identified the MIT officer who was killed as 26-year-old Sean Collier of Somerville, according to the Boston Globe. The MBTA police officer who was injured has been identified as Richard H. Donohue.