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FLATBUSH, Brooklyn — A Brooklyn deli worker was killed when he was shot in the head Tuesday night, police said.

Police responded just before 7:35 p.m. to a 911 call of a man shot inside 803 Flatbush Avenue, at the corner of Caton Avenue in Flatbush, authorities said.

Responding officers arrived to find the 20-year-old victim unconscious and unresponsive with a gunshot wound to the head, police said.

EMS pronounced the deli employee dead at the scene. Officials later identified him as Fadhl Moosa of Brooklyn.

An NYPD spokesperson said an individual was taken into custody and was being questioned overnight, but no arrests had been made; the man was released by Wednesday evening, and officials were still searching for the suspect.

While police units were responding to the scene, there was an accident involving NYPD vehicles that left four officers injured, authorities said. All of the officers are expected to be okay.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).