A Scots teenager watched as his father was swept to his death in a Canadian waterfall accident.

The 16-year-old had managed to scramble to the river banks as he and his father took part in a float tubing expedition in British Columbia.

His 50-year-old father is missing presumed drowned while the bodies of an elderly Canadian couple had been recovered by emergency services on the Kettle River, near Grand Forks on Saturday.

Search and rescue personnel confirmed that the missing man is the father of the teenage boy who managed to swim to safety.

Barry Savitskoff, head of the Grand Forks Search and Rescue, told the Vancouver Sun that the boy had frantically run down the river bank as his father was swept towards Cascade Falls, a dangerous waterfall on the river.

He added that the teenager was "pretty distraught" and had wanted to save both his father and the elderly Canadian couple who were killed in the incident.

The British Columbia Coroners Service confirmed that the Canadian couple who died in the incident were 74-year-old Ronald and 71-year-old Jacqueline Legare, who were from the Christina Lake area of the region.

In a statement, the coroners service said the Legares were "part of a large group float tubing on the Kettle River when they were witnessed being swept into the Cascade Canyon by swift currents."

Float tubes are often used by anglers fishing in rivers.

The Royal Canadian Mounted Police said on Monday the helicopter and ground searchers were unable to find the missing father.

In a statement, the force added: "An extensive air and ground search was completed late Sunday afternoon which yielded no sign of the man. Search and rescue technicians will monitor the area in the coming days in attempts to locate the man's body.

"The family of the 50-year-old Scottish man have been advised by the RCMP and Grand Forks Victim Services personnel, that the man is presumed to have drowned."

The Foreign Office confirmed it was aware a British national was reported missing in Canada over the weekend. A spokesman said: "We stand ready to provide consular assistance."

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