Town of Hempstead Supervisor Don Clavin said that around 1 p.m. lifeguards, who are trained to identify sharks, spotted a blacktip reef shark about 20 yards offshore at Lido Beach.
A second lifeguard witnessed a shark jump out of the water.
"It was about 20 yards offshore. Simultaneously to that, we had another lifeguard come over and say that they saw a shark breach out of the water and spin," Lido Beach lifeguard Julia Burns said.
They immediately closed the town's beaches and got all swimmers out of the water.
Sightings were also reported at Long Beach and Jones Beach.
The sharks, named for their black-colored fins, are native to the Caribbean and are typically seen in our area.
Clavin said their presence is concerning because they typically feed on smaller fish that tend to stay near the shoreline.
Clavin said several sightings of bull sharks last year motivated the town to invest in its 'shark patrol,' specifically buying personal watercraft for patrolling the shoreline.
"We have the jet ski in there, we have our boat patrols out there, we have, actually, guards walking up and down the shoreline," Clavin said.
Clavin said Nassau County also deployed aerial patrols.
"This is multiple sharks spotted throughout this shoreline. We're talking four miles of beach, right here, from Point Lookout to Long Beach. And we're going to take every precaution and keep this up the entire season," Clavin said.
At a 3 p.m. briefing, Clavin said no sightings had been reported in the last 45 minutes. The town's beaches reopened soon after, but swimmers were only allowed into the waters up to their knees.
It's the latest in a rash of recent sightings and shark interactions at beaches on Long Island.
Multiple spotted off Jones Beach Tuesday, one day after a lifeguard there was potentially bitten, and as a result, swimming was prohibited until further notice.
ALSO READ | Air, water patrols boosted after 2 days of shark sightings on Long Island
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