A man has apparently been killed after being attacked by a shark off the coast of Western Australia - the fifth such incident in the region in less than a year.
The victim, who has not yet been named, is said to have been surfing in the ocean north of Perth.
A police spokesman said emergency services were contacted just after 9am on Saturday by a friend of the victim.
"The report to police was made by the surfing mate of the victim who was present at the time," said Sergeant Gerry Cassidy.
A number of police boats and fisheries vessels have been searching for the missing man along the coast.
The attack happened 4km (2.5 miles) south of popular holiday destination Wedge Island, which is 160km (99 miles) north of Perth.
It is the fifth fatal shark incident off Western Australia since September - an unprecedented number that sparked calls earlier this year for a cull.
A sea kayaker narrowly escaped the jaws of a Great White last month, with a friend managing to pluck him from the water after he was rammed by the shark off Perth's Mullaloo Beach.
That attack came just hours after another Great White, thought to be five metres (16ft) long, lunged from the water at a crab fisherman at a dive park.
Sharks are common in Australian waters but deadly attacks are rare, with only one of the average 15 incidents a year proving fatal.
Experts say the average number of attacks in the country has increased in line with population growth and the popularity of water sports.
After the last attack in April, Western Australia Fisheries senior shark expert Rory McAuley said the state was the deadliest place in the world for shark attacks.