Race Point Beach in Provincetown was briefly closed to swimmers on Saturday after two lifeguards spotted a great white shark feet from the shoreline.

The Cape Cod Times reports that lifeguards Nathan Miskiv and Jack Pearson were on duty when Miskiv saw a dark shape about four feet from the beach.

"[Pearson] looked over. He said, 'Oh, yeah, yeah. That's a shark. Raise the flag,' " Miskiv told the Times.

Race Point Beach was closed for an hour and reopened when the shark was not spotted again -- at least the third time the beach has closed for a shark sighting this summer, the Times reported.

Great white populations near Cape Cod have rebounded in recent years. In 2012, 34 white sharks were tagged off the Cape, according to the state's Executive Office of Environmental Affairs. In 2015, the Atlantic White Shark Conservancy identified 120 individual Great Whites in the same region, after cataloging 68 the year before.

Despite the growing population, shark attacks on humans are still rare. There have been two shark attacks off Massachusetts waters since the year 2000, according to the incident database compiled by the Global Shark Attack File. Neither were fatal; the last deadly shark attack in the state occurred in 1936.