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Mario Tama/Getty Images Police investigate along Dexter Avenue.

Shootout and killing of one suspect

Watertown – Suspects and the police exchange gunfire. A Watertown resident, Andrew Kitzenberg, 29, said he saw two men engaged in “constant gunfire” with police officers. A police S.U.V. “drove towards the shooters,” he said, and was shot at until it was severely damaged. Mr. Kitzenberg said he saw the shooters throw a bomb at the police, but it “went 20 yards at most.” One of the suspects, Tamerlan Tsarnaev, is tackled by the police and critically injured. He is pronounced dead at a hospital at 1:35 a.m. His brother, Dzhokhar A. Tsarnaev, gets back into the S.U.V. and drives at the officers, breaking through them.

