ROCHESTER, N.Y. >> A police officer was fatally shot and another wounded in Rochester officials said Friday.

The officers were on patrol as part of a plainclothes tactical unit when they were shot around 9:15 p.m. Thursday, authorities said.

Police Chief David Smith identified the slain officer as Anthony Mazurkiewicz, a 29-year member of the department.

“Last night, Officer Mazurkiewicz and his partner, Officer Sino Seng, were attacked in a cowardly ambush and fell victim to the very violence in our community that we are trying to combat,” Smith said at a briefing Friday. No arrests have been made.

Mazurkiewicz was shot at least once in the upper body, Smith said. He was taken to a hospital, where he died. Seng was treated at another hospital and released.

A bystander suffered injuries that were not life-threatening and was treated at the scene, authorities said.

— The Associated Press