A shark was sighted off the shores of Marconi Beach in Wellfleet today, resulting in the closure of the beach and restrictions at other area beaches, officials said.

A National Park Service lifeguard saw the shark at 1:05 p.m. while on duty at the beach, said Amy Mahler, a spokeswoman for the Massachusetts Executive Office of Energy and Environmental Affairs.

Matthew Bielecki, a US park ranger confirmed the sighting. He was unable to say what species the shark was, but noted that the shark was 30 yards from the shoreline heading north, Mahler said.

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The beach was closed immediately, Mahler said.

Other area beaches did not close but had wading periods, Mahler said.