Three people had to be pulled out of the East River in Long Island City, police said.
The three men -- ages 21, 22 and 34 -- were pulled out of the water in Gantry Plaza State Park just after 8 p.m. Monday, police said.
One of the men did manage to swim to shore, but at least one was unable to.
Det. Andrew Sperber, a diver with the Emergency Services Unit, pulled all three to safety, police said.
The 21- and 22-year-old were taken to an area hospital for evaluation.
It was not immediately clear why they jumped in.