Swimmers are being warned to stay out of the water after multiple sharks were spotted feeding on a whale carcass near Rottnest Island.
The whale is drifting north-east of Thomson Bay ferry jetty and sharks have been sighted just 100 metres from the shore, forcing Rottnest Island Authority to close beaches within a one kilometre radius of the whale.
These include Thomson Bay, Pinky Beach, The Basin and Longreach Bay.
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Rottnest Island rangers are working with The Department of Primary Industries and Fisheries to track the whale's movements and people have been warned they are entering the water at their own risk.
The shark sightings come after several attacks in WA waters in recent months.
A search was called off for father-of-two Paul Millachip who was pulled under the water by a 4.5 metre shark off Port Beach in Fremantle on November 6.
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Another search was also called off for missing free diver Matthew Phillips whose car and empty diving bag were found in Lancelin on November 8.
According to authorities, there have been 15 shark attacks in Australian waters this year, three of which were fatal.
