State Trooper, Civilian Stop Cambridge Gunman Who Wounded 2

A gunman fired dozens of rounds from an assault-style rifle at vehicles on Memorial Drive in Cambridge, Massachusetts, on Monday afternoon, wounding two men with life-threatening injuries before a State Police trooper and an armed civilian shot him, authorities said.

The incident unfolded around 1:30 p.m. along a busy stretch of the road between River Street and the Pleasant Street extension, near the Charles River. Middlesex District Attorney Marian Ryan said the suspect, identified as 46-year-old Tyler Brown of Boston, walked down the middle of the street firing erratically at passing cars. Investigators believe he discharged 50 to 60 rounds, striking at least a dozen vehicles, including a State Police cruiser and a U.S. Postal Service truck. A bullet pierced the postal truck's windshield, stopping inches from the driver's headrest, but the driver was unharmed.

Two men in separate vehicles were struck by gunfire and transported to Boston hospitals. Officials stated there was no known connection between Brown and the victims.

The episode began earlier that day when Brown's parole officer reported a suicidal statement around 12:30 p.m., prompting Boston police to attempt a...