A surfer has reportedly been attacked by a shark in ocean off the south-west of Western Australia.

A spokesman for the Department of Primary Industries and Regional Development said the woman, 46, emerged from the water with a bleeding foot at Cowaramup Bay Beach, Gracetown.

The incident occurred at about 10.30am, Western Australian time. Nearby residents told the ABC an ambulance was seen at the scene.

Surf Life Saving WA teams conducted aerial patrols of the area, which is north of Margaret River and a popular destination for surfers.

Surf Life Saving WA tweeted that a shark had been spotted 50 metres off shore.

The Shire of Augusta-Margaret River has closed the beach since the incident.

“Rangers have closed Cowaramup Bay Beach due to a shark incident. The beach will be closed for 24 hours from Huzza’s Car Park to Cowaramup Boat Ramp. Please adhere to all warnings and signage,” Surf Life Saving WA said.

A St John spokeswoman said the woman had been taken to Margaret River Hospital for treatment.