Authorities are currently investigating a shark bite incident at a South West beach.
It's believed a male surfer was attacked by a suspected white shark at Boat Ramp Surfing Spot near Gnarabup Beach around 8.45am on Monday.
The extent of the surfer's injuries is unclear.
Surf Life Saving WA reported a white shark sighting at Gnarabup Beach in Prevelly about 9am on Monday.
Officers from the Shire of Augusta Margaret River have closed beaches from Gas Bay to Margaret River Mouth.
Mandurah Crab Fest boasts huge range of free, family friendly entertainment
Fuel prices surge in Perth, Mandurah
Teen boys charged over Mandurah burglaries
Tragic update in search for missing man Robert Snyder
Premier Roger Cook to leave Kwinana electorate, move to Perth
Mandurah Marine Rescue's new vessel named in memory of nun who survived 1959 boating accident
Teen dies in motorbike crash at Waroona Dam
Shark alert issued after whale carcass reported at Preston Beach
Kwinana businesses to refuse serving students during school hours