ROCHESTER, N.Y. (AP) — A police officer has been fatally shot and and another wounded in Rochester, New York.

Authorities say the officers were on patrol as part of a plainclothes tactical unit when they were shot after 9 p.m. Thursday.

Police Chief David Smith identified the slain officer as Anthony Mazurkiewicz.

Smith said Friday that the two officers were attacked in “a cowardly ambush.” A bystander suffered minor injuries.

No arrests have been made.

The officers were shot the same day Mayor Malik Evans declared a “gun violence state of emergency” in Rochester.