WATERTOWN, Mass. (AP) — A tense night ofpolice activitythat left a university officer dead on campus just days after theBoston Marathonbombings and amid a hunt for two suspects caused officers to converge on aneighborhoodoutside Boston, where residents heard gunfire and explosions.
The chaos inWatertown, about 10 miles west ofBoston, occurred just hours after aMassachusetts Institute of Technology policeofficer was shot and killed on campus. It was unclear if the outbursts of violence were related. No arrests had been made in the officer's fatal shooting, and a manhunt was on for the shooter.
The officer had been responding to report of a disturbance Thursday night when he was shot multiple times, according to a statement from the Middlesex district attorney's office andCambridge police. It said there were no other victims.
In Watertown, witnesses reported hearing multiple gunshots and explosions at about 1 a.m. Friday. Dozens ofpolice officersand FBI agents were in the neighborhood and a helicopter circled overhead.
State police spokesmanDavid Procopiosaid, "The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers."
Boston cab driver Imran Sais said he was standing on a street corner at a police barricade across from a diner when he heard an explosion.
"I heard a loud boom and then a rapid succession of pop, pop, pop," he said. "It sounded like automatic weapons. And then I heard the second explosion."
He said he could smell something burning and advanced to check it out but area residents at their windows yelled at him, "Hey, it's gunfire! Don't go that way!"
MIT said right after the 10:30 p.m. shooting that police were sweeping the campus in Cambridge and urged people to remain indoors. They urged people urged to stay away from the Stata Building, a mixed-use building with faculty offices, classrooms and a common area.
Hours later, MIT, which has about 11,000 students, said the campus was clear but the shooter was still on the loose.