Gunman shot by trooper and civilian after opening fire on Memorial Drive in Cambridge, more than 60 rounds were fired by the attacker

May 13, 2026 | Defensive Gun Use

Authorities say a civilian and trooper likely prevented a mass-casualty event on the crowded roadway. The gunman fired more than 60 rounds while walking beside the road before officers shot and wounded him.

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A gunman who opened fire with what authorities said was an assault-style rifle on Memorial Drive in Cambridge, Massachusetts Monday afternoon was shot by a responding State Police trooper and a civilian. Two men in separate cars were shot and have life-threatening injuries. 

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The suspect, 46-year-old Tyler Brown of Boston, is in custody and is being treated for gunshot wounds at a Boston hospital. 

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It happened around 1:30 p.m. between River Street and the Pleasant Street extension. Videos from witnesses showed the gunman walking down the middle of the street firing and waving a rifle. . . .

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Brown was walking down the middle of Memorial Drive, firing the rifle in “an erratic fashion at various vehicles along the road,” Ryan said at a news conference Monday night. 

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Ryan said 50-to-60 rounds were fired and at least a dozen vehicles were hit by bullets. Two men in separate vehicles were shot and are currently being treated for life-threatening injuries at Boston hospitals. 

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As people scattered from their cars, Ryan said a State Police trooper and a civilian, a Marine veteran who has a license to carry a gun, went toward the suspect with their weapons. 

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“Both the trooper and the civilian fired their weapons, and that suspect was struck multiple times in the extremities,” Ryan said. . .

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.Matt Schooley, Louisa Moller, and Kristina Rex, “Gunman shot by trooper and civilian after opening fire on Memorial Drive in Cambridge; 2 in critical condition,” CBS News, May 12, 2026.

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