Family and friends of a man who was fatally shot by an off-duty New York Police Department officer during an apparent road rage incident have gathered for a vigil.

It was held Wednesday night at the intersection in the East New York neighborhood of Brooklyn where 37-year-old Delrawn Small was killed.

Relatives spoke out late Wednesday before joining protesters in blocking traffic. They're demanding answers from police.

Authorities say the off-duty officer was driving his personal vehicle early Monday when he was involved in a traffic dispute with Small. When both cars stopped at a red light, police say Small got out of his vehicle and punched the officer repeatedly through an open window. The officer pulled out his service weapon and killed Small.

The shooting remains under investigation.