Shark sightings closed Nauset Beach in Orleans twice and Marconi Beach in Wellfleet once on Friday.
This brings the tally up to five closures in three days for Nauset Beach.
The beach was closed at 10:50 a.m. after a shark was spotted attacking a seal and was set to reopen at 11:50 a.m. if no more sharks were seen, said a spokeswoman for Nauset Beach.
“Confirmed predation of a seal, 100 yards out in front of the south lifeguard tower at Nauset Public Beach in Orleans,” the Atlantic White Shark Conservancy Sharktivity app said.
The beach was closed again due to a shark sighting at 2:10 p.m. and reopened at 3:10 p.m., a Nauset Beach employee said.
Marconi Beach in Wellfleet also closed Friday after a shark sighting around 4:50 p.m. and is set to reopen at 5:50 p.m. The shark was spotted 100-150 yards from shore by a lifeguard, according to the Sharktivity app.