|The sinking boat.|
Five Britons were killed when a whale-watching boat sank off thecoast of western Canada, the UK Foreign Secretary Philip Hammond has said.
The boat carrying 27 people sank near Tofino, a popular tourist area on Vancouver Island, on Sunday afternoon.
Officials said 21 people had been rescued and one was still missing.
The cause of the accident remains unknown and investigations are ongoing, but sea conditions at the time of the incident were reported to be calm.
The boat, Leviathan II, made a mayday call before sinking about 8 miles (12km) west of Tofino.
'Terrible accident'Mr Hammond said: "It is with deep sadness that I can confirm five British nationals have lost their lives when the whale watching boat they were on sank off Western Canada on Sunday.
"My thoughts are with the family and friends of all those affected by this terrible accident."
He said consular staff in British Columbia were supporting the family members of those who had died and were in close contact with the Canadian authorities.
Within 30 minutes of the mayday call, a rescue helicopter and boat were on the scene. Other boats in the area also responded to the call for help.
Tofino fishing guide Lance Desilets said at least 12 rescue boats were already out on the water when he arrived on the scene.
"I saw a lot of personal belongings, a long diesel slick and the top 10 feet of the Leviathan II sticking out of the water," he said. "It's a sad day for our community."
Melissa Kai, of the Joint Rescue Co-ordination Center in Victoria, British Columbia said the search-and-rescue efforts had concluded, and the case of the missing person had been turned over to Royal Canadian Mounted Police.
The 20m (65ft) boat was operated by Jamie's Whaling Station and Adventure Centres.
In a statement on the company's website, owner Jamie Bray said: "It has been a tragic day. Our entire team is heartbroken over this incident.
"We are doing everything we can to assist our passengers and staff through this difficult time. We are co-operating with investigators to determine exactly what happened."
Another whale-watching boat operated by the same company capsized in 1998, killing two people, including the boat operator and a tourist from Germany.
The six-metre vessel was on a three-hour trip in the area of Plover Reef when it was hit by a large swell, throwing four people into the water.