A shark sighting prompted Massachusetts officials to temporarily close a beach to swimming.
The Atlantic White Shark Conservancy says there was a confirmed attack on a seal by white shark just before 10 a.m. Saturday off Nauset Beach in Orleans.
Swimming was prohibited for about an hour.
Several Cape Cod beaches have been temporarily closed to swimming this summer because of shark sightings.
Surveillance has been stepped up this summer after two shark attacks on humans off Cape Cod last year, including one that killed a 26-year-old Massachusetts.