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CANNON BEACH, Ore. (AP) — Authorities are warning beachgoers after several people reported shark sightings near Cannon Beach and Seaside.

KGW reports ( ) that lifeguards received reports of dorsal fin sightings on Saturday. A paddle-boarder reported seeing the shark’s mouth and feeling it bump her board.

On Tuesday, state parks workers reported shark fin sightings between Cannon Beach, Ecola State Park and Seaside.

Oregon Parks and Recreation Department officials say the beaches will stay open and that warning signs have been posted.

Officials say the size and species of the sightings are unknown, and the reports haven’t been verified. More than a dozen shark species live off the Oregon coast.

Parks officials also recommend that people using the ocean, especially surfers, consult other surfers for advice.