Water police and rescue helicopters are searching for a man after a shark attack off Port Beach in Fremantle, Perth.
File photo: It's believed the man was attacked by a great white and tiger shark Photo: 123RF
It is believed the man was swimming next to a dinghy at the time.
Authorities believe he was attacked by two sharks, a great white and a tiger.
Swimmers and witnesses at the scene are visibly shocked.
At least five Water Police and Sea Rescue boats and two helicopters are scouring the area and an ambulance has been sent to the scene.
Beaches from Leighton to South Beach have been closed.
Actions of witnesses 'heroic and very brave'
Acting Inspector Emma Barnes said there was little information police could provide at this point.
"We're coordinating a marine search in conjunction with Fisheries for reports of a male adult who has been attacked by a shark," she said.
"I can say that the actions of the witnesses were heroic and very brave: for getting everyone else in the water out of the water and notifying everyone of what was happening."
Leeman shark attack victim shocked
Witness Alex Dodds, who was at Port Beach this morning, said he was shocked to find out about the incident.
"Apparently they're looking for a body, so sounds pretty bad. Hopefully they can find it," he said.
"I was coming down for my first swim post-op, six weeks ago. First time back in the ocean after my [shark] attack, so pretty heavy.
"I was attacked up in Leeman in June by a big great white, so it's close to home.
"I just feel so bad, obviously, for the bloke and then the family as well, it's just so sad."
Bodyboarder Kaiden Bauld was near the groin at what's known as Sandtracks Beach when he saw a teenager on a boat coming straight at him and his friend, telling them to get out of the water as there had been a shark attack.
"So I ran out of the water and onto the rocks and I looked over and there was a shark in the middle of the water … you could see the fins popping out," he said.
"After that, we rode down here [towards Port beach] and everyone was saying 'someone has been taken by a shark'.
"Eventually they cordoned [the beach] off."
The attack comes on the anniversary of a shark attack that claimed the life of local swimmer Ken Crew off Cottesloe Beach in 2000.
More to come
-ABC