City Ocean Safety officials confirmed shark sightings today at Sunset Beach and Waimea Bay.

Lifeguards saw a 6- to 8-foot shark near the river mouth at Sunset Beach and advised swimmers and surfers to leave the water before posting warning signs at about 3:30 p.m., said Emergency Services Department spokesman Bryan Cheplic. The signs were removed at 5:30 p.m., Cheplic said.

Lifeguards at Waimea Bay, meanwhile, saw an estimated 7-foot shark in the bay about 45 minutes later during a rescue operation involving a damaged catamaran, Cheplic said.

The signs at Waimea will remain up overnight and officials will evaluate the situation tomorrow morning, Cheplic said.