CANNON BEACH, Ore. – Authorities are warning beachgoers after several people reported shark sightings near Cannon Beach.

Lifeguards received reports of dorsal fin sightings on Saturday, according to Cannon Beach Police Chief Jason Schermerhorn.

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

Schermerhorn said state parks employees will post warning signs on local beaches soon.