POINT LOOKOUT, New York (PIX11) — Multiple sharks were spotted off the coast of Long Island Friday, prompting red-flag warnings for swimmers.

Trained lifeguards spotted two sharks in the water off Point Lookout beach around 11:30 a.m., and all Town of Hempstead beaches were closed to swimming, officials said. The lifeguards saw two fins cutting through the water. The sharks, each about 6 feet long, got as close as knee-deep water while chasing bunker fish, officials said.

Shark patrol Jet Skis were deployed. The water was monitored for any additional shark activity before swimming was reopened around 1:30 p.m.

Additional shark sightings were reported off Jones Beach on Friday, officials said. However, after reviewing drone footage, a DEC shark expert told officials it appeared to be a cobia, a large fish that resembles a shark.

Shark sightings at Long Island beaches have been on the rise this summer. Last Sunday, a man hooked what appeared to be a shark at Smith Point Beach on Fire Island. And In July, three people were bitten by sharks in just a matter of days.