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Two Cape Cod beaches were closed to swimmers Tuesday afternoon because at least one great white shark continues to lurk offshore of the Head of the Meadow Beach and Coast Guard Beach, according to Cape Cod National Seashore and Truro officials.

A shark was first spotted around 11:30 a.m., and both federal and town officials followed their shark protocols and closed the beaches for about an hour, which usually is long enough for the predator to swim on.

But the shark — it might be the same one, it might be a different one — didn’t move on.

“Confirmed shark sighting again the same area,” Cape Cod National Seashore officials reported at 12:52 p.m. on the app operated by the Atlantic White Shark Conservancy, a nonprofit group conducting research on the apex predator along with the state Division of Marine Fisheries and Gregory Skomal, the state’s shark expert.

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The Truro Recreation Department also tweeted at 12:49 p.m. that a shark was hanging around. The two beaches, the town department tweeted, “remains closed to swimming due to shark sighting until 1:45 p.m.”

The Head of the Meadow Beach was re-opened to swimmers by 1:45 p.m., according to Leslie Reynolds, chief ranger for the Cape Cod National Seashore. She said she could not speak to the re-opening of Coast Guard Beach, and messages left with Truro officials were not immediately returned late Tuesday afternoon.

Both the national seashore and the Truro recreation department posted red flags at the beaches, banning swimming.

Beaches in Wellfleet and Plymouth were closed Monday due to shark sightings.


Danny McDonald of the Globe Staff contributed. John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.