Fixing LED lights under surfboards could stop great white sharks from attacking, Australian scientists find.

Kai McKenzie's leg was severed and later washed ashore, but he has vowed to return to the water as soon as possible.

Kai McKenzie, 23, was attacked by a three-metre-long great white shark in Australia on Tuesday.

A law enforcement officer was able to apply a tourniquet to staunch the severe bleeding.

One woman was said to have had part of her arm amputated after being bitten, while two girls were also attacked.

A British man has been seriously injured following a shark attack in the Caribbean island of Tobago.

Peter Smith's wife has thanked friends who fought the shark during the attack on Tobago's coast.

Peter Smith, 64, was 10 metres off the shore when he was attacked by a bull shark, a local official says.