NEW YORK (AP) — Four people, including a 5-year-old boy, have been shot and killed at an apartment building in New York City.

Detectives are investigating whether the deaths Monday night may have been a murder-suicide.

Officers were called shortly before 9 p.m. to the building in the Astoria section of Queens. They found two women, a man, and the boy had been shot.

It was not immediately clear if they were related. Police continue to investigate the circumstances.

TV news video showed a cluster of police cars and officers around the low-rise brick building and officers in heavy gear walking around it, as bystanders gathered behind police lines.