The New York City Police Department said four were dead inside what appears to be an unlicensed social club.
At least four were killed and several others were injured when shots were fired at an illegal gambling site at a Brooklyn club Saturday morning, police said.
"We need new tools to combat the surge in gun violence we are seeing in certain precincts across the city, including the 77th", Brooklyn Borough President Eric Adams said in a statement.
As of now, two people have been brought in for questioning as part of the early stages of the investigation. Shea said there was "evidence of gambling" including cards and dice inside.
Police say the shooting took place in the Crown Heights neighborhood of Brooklyn at an address that corresponds to a private social club on an online map of the street. They were all between the ages of 32 and 49.
Police have no information on a suspect or motive, NYPD spokesman Brian Magoolaghan said.
Chief of Detectives Dermot Shea said four men were dead at the scene and the others were taken to hospitals with injuries that were not life-threatening.
No arrests have been made, according to the Associated Press.
It was not immediately clear what prompted the gunfire.
Mayor Bill de Blasio, a Democrat, said on Twitter that the city "awoke to senseless gun violence".
Crime-scene tape surrounded the building Saturday morning and investigators in white jumpsuits could be seen going in and out.
An eighth person sustained a minor leg injury trying to get away from the shooting, which happened in the Crown Heights area of Brooklyn.