Town beaches in Plymouth, Massachusetts, were closed to swimmers after a confirmed shark sighting Saturday afternoon.
Swimming at Plymouth beaches was suspended for three hours after the harbormaster received a report from a lobsterman who said he saw a nearly 9-foot long white shark at the surface alongside his boat.
The beaches re-opened to swimming by 3:30 p.m., according to the harbormaster.
Several Cape Cod beaches have been temporarily closed to swimming this summer because of shark sightings.
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Earlier in the day Saturday, Nauset Beach in Orleans was closed for an hour after there was a confirmed attack on a seal by a great white shark just before 10 a.m.
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 man.