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Beaches on the Cape and Nantucket close after at least a dozen shark sightings

The shark was spotted near Cisco Beach, prompting the harbormaster to declare the beaches closed for two hours.

Lifeguards Avery Stolte and Willem Steiner watched for sharks Saturday at Cisco Beach after the second closing of the day on Nantucket’s south coast beaches. –Stan Grossfeld/Globe staff

Beaches on Cape Cod and Nantucket were peppered by at least a dozen shark sightings Saturday, leading to multiple closures in the late morning and afternoon, authorities said.

On the Cape, shark sightings were confirmed near Coast Guard Beach in Provincetown, Long Nook, High Head, and Ballston beaches in Truro, Marconi Beach in Wellfleet, and Nauset Beach in Orleans in the late morning and afternoon, according to the Atlantic White Shark Conservancy’s Sharktivity app.

Long Nook Beach was closed to swimming from 1:15 to 2:15 p.m., according to the app, citing town officials. Another sighting was listed on the app a short distance away.