Two gunmen opened fire at a massive Brooklyn, New York, block party on Saturday night, leaving a 38-year-old man dead and 11 others injured, the New York Post reported.

The gunfire erupted just before 11pm, as the annual two-day “Old Timers Day” party was ending and thousands of attendees were leaving.

The violence was preliminarily blamed on two shooters who remained at large early Sunday, and who had blasted into the crowd despite a contingent of some 100 cops monitoring the event.

The injured were rushed to nearby hospitals.

By midnight, detectives had found one abandoned firearm and were combing the ground for more evidence at the crime scene.