Newcomb Hollow and Marconi beaches in Wellfleet, Long and White Horse beaches in Plymouth, and Nauset Beach in Orleans were closed to swimmers Friday after sharks swam in the water nearby, officials said.
Newcomb Hollow Beach was closed at 9:40 a.m. when two great white sharks pinged a buoy, said Suzanne Thomas, a Wellfleet beach administrator. The beach was set to reopen an hour later, but it actually opened at 11:30 a.m. because a shark pinged a buoy again at 10:30 a.m.
Marconi Beach was closed for an hour at 2:02 p.m. after a shark sighting, according to the Atlantic White Shark Conservancy’s Sharktivity app. The closure was extended until 3:50 p.m. because another shark was spotted, the app said.
Long Beach and White Horse Beach in Plymouth were closed for three hours when a shark was spotted, the app said at 3:02 p.m.
“The Plymouth Harbormaster Department received a confirmed sighting of a shark sighting breaching 300 yards off Long Beach in the vicinity of the crossover,” the app said.
The water at Nauset Beach in Orleans was closed from 3:45 p.m. to 4:45 p.m. after a great white shark was seen attacking a seal 25 feet off shore, a quarter mile north of the beach, according to Sharktivity.
Beaches on the Cape and Islands have been shut 88 times since July 1, including 71 times since since the beginning of August, according to a Globe tally. This is the fourth time a Plymouth beach was closed since Aug. 12.