A hair-raising spate of shark attacks on Long Island beaches has spurred New York State officials to commit to purchasing dozens of new surveillance drones.

The investment marks the latest effort by the state to soothe swimmers startled by a wave of beach closures and at least four confirmed shark bites across Fire Island and the Hamptons during the holiday week.

Gov. Hochul’s office did not provide an exact number of new drones on Friday, but said $1 million in funding had been secured for significant acquisitions. The state added 10 high-flying drones to its shark spying fleet going into the summer, more than doubling the size of its arsenal.

“These new drones will increase the shark monitoring capacity of local governments across Long Island and New York City, ensuring local beaches are safe for all beachgoers,” Hochul said in a Friday statement.

two shark bites were reported on Fire Island, and another was confirmed in the Town of Southampton, according to Long Island cops. A day earlier, officials reported one confirmed shark bite and one possible shark bite on Fire Island.

It was not clear what types of sharks were involved in the encounters.

New York has not had a fatal shark bite in decades.

Last year, the state logged eight shark bites, meaning that New York accounted for 1-in-7 bites worldwide, according to a tally by the University of Florida.

Shark encounters were once an extreme rarity on New York beaches. But cleaner water and enormous schools of baitfish — food for sharks — have been drawing the predatory fish closer to shore, according to experts.

A range of sharks — including blue sharks, spinner sharks, sandbar sharks, hammerheads and more — trawl waters near New York beaches, but the fearsome great white sharks that have frightened beachgoers on Cape Cod have not appeared.

Increased surveillance may also be feeding the impression that there are more sharks on the shore.

A school of some 50 fish spotted 200 yards from the shores of Robert Moses State Park delayed the opening of the beach for 90 minutes on Tuesday. The state Parks Office said Tuesday that it believed the school was made up of sand tiger sharks, which typically grow between 7 and 10 feet long and are common in New York waters.

But experts questioned whether the fish were in fact sharks. Tobey Curtis, a shark expert with the National Oceanic and Atmospheric Administration, said in an interview on Thursday that he believed the school was made up of red drum, bass-like fish that grow to about 2 feet long at maturity.

Officials seem to be taking a better-safe-than-sorry approach to the sharks. Though bites are thought to be accidents — humans are not natural prey for sharks — they can leave swimmers with nasty wounds.

Last year, a 49-year-old Arizona man who was gashed by a shark off Seaview Beach on Fire Island needed some 60 stitches, said Thomas Ruskin, the Seaview Association president.

Lifeguards have been on high alert this summer. And officials have urged swimmers to follow smart safety practices, such as staying near lifeguards and avoiding murky and fish-filled waters.

The state Department of Environmental Conservation urges beachgoers to stay close to shore and to swim in groups.