A British man has been seriously injured after being attacked by a shark on the Caribbean island of Tobago.
The 64-year-old is receiving critical care after serious injuries to his left arm, left leg and stomach, according to a local official.
He said the man had been attacked 10 metres off the shore in Courland Bay, on the island's north coast, at 09:15 (14:15 BST) on Friday.
The Foreign Office said it was supporting the victim's family.
The incident involved a bull shark estimated to be eight to 10 ft (2.4m to 3m) long and 2ft (60cm) wide, according to a statement by the Tobago House of Assembly's chief secretary Farley Augustine.
In a detailed Facebook post, he said the victim was being cared for at Scarborough General Hospital, and listed the injuries sustained as: "Left hand severed from elbow down. Left thigh severed. Laceration to stomach."
Eyewitness Orion Jakerov, water sports manager at the nearby Starfish Hotel, said other people in the water were "physically trying to fight off the shark".
He told the local broadcaster TTT Live: "I don't think they saw it. They were about waist height in the water so they weren't out of their depth.
"I think their backs were turned and they were just kind of lounging around. Nobody saw the shark coming."
Mr Augustine said: "Unfortunately, a visitor to the island was attacked by shark earlier this morning in the vicinity of the Starfish Hotel.
"The Chief Secretary has spoken to the British High Commissioner."
'Neutralise the threat'
Authorities closed seven beaches and all coastal areas between the town of Plymouth on the island's northern coast and Store Bay on its western tip, a stretch of around seven miles (11.3km).
The stretch also includes a marine park surrounding the Bucco Reef, one of the island's largest coral reefs and a popular tourist attraction.
Officials said the measures had been taken "out of an abundance of caution" and would apply at least until the end of Friday.
They also said they would "neutralise the threat if possible".
Drones were also used to carry out surveillance of the area, and anyone operating a boat was urged to exercise caution.
Bull sharks are known to be aggressive and are most often found in shallow waters along tropical coastlines, making them - along with great white and tiger sharks - among the most likely species to come into contact with, and attack, humans.
Tobago, one of the constituent islands of Trinidad and Tobago, is located in the southern Caribbean, around 74 miles (119km) off the coast of South America.
According to the International Shark Attack File database, the vast majority of shark attacks in the region occur further north, in the central Caribbean and off the eastern and southern coasts of the US.
In the last 20 years, there have been only two recorded shark attacks as far south as Tobago, and neither was within 200 miles of the island itself.