At least four people were killed and three others were wounded in a shooting at an unlicensed private social club in Brooklyn, New York early Saturday, police said.

No one has been arrested and the motive and exact circumstances are not known, according to a local police official.

The shooting on the borough's major artery, Utica Avenue, took place at the Triple A Aces Private & Social Rental Place, described by NYPD Chief of Detectives Dermot Shea as "an illegal gambling location."

Four men were pronounced dead at the scene, while two other men and a woman suffered non-life threatening injuries, the police official said.