Police say lifeguards stationed at Rockaway Beach pulled an unconscious swimmer out of the water on Friday.
The swimmer was rescued near Shore Front Parkway and Beach 91st Street around 5:15 p.m., before being transported to a nearby hospital.
His age wasn't immediately known, but police officials say the victim was unconscious and unresponsive at the time he was removed from the water.
Red flags, which signal swimming is not allowed, were placed in the sand near the police response Friday evening.
Get Tri-state area news delivered to your inbox.> Sign up for NBC New York's News Headlines newsletter.
This story is developing.