Man stabbed in Brooklyn after being asked if he was in a gang

Detectives in Brooklyn are looking for the brute who punched and stabbed a man after asking the victim if he was in a gang.

The incident occurred outside of an apartment building located at 158 Avenue U in Gravesend at around 4:30 a.m. on May 31, police reported.

According to law enforcement sources, the victim, a 27-year-old man, was standing in front of the building when the suspect approached and asked the victim if he was in a gang.

Seconds later, cops said, the suspect went on the attack, punching the victim in the face and leading to a physical struggle.

During the struggle, police reported, the attacker slashed the victim across the face and stabbed him in the left forearm, then fled on foot.

Left bloody, the victim meandered to Coney Island Hospital, where he was treated for