Former Top Gear host Richard Hammond has escaped serious injury after a crash in Switzerland.

Mr Hammond was attending a car race when his vehicle, a Rimac electric supercar believed to be worth £2 million, left the road and mounted a grassy verge.

"It was the biggest crash I've ever seen and the most frightening ," Jeremy Clarkson tweeted on Saturday afternoon. "But incredibly, and thankfully, Richard seems to be mostly OK."

The Grand Tour tweeted: "Richard Hammond was involved in a serious crash after completing the Hemburg Hill Climb in Switzerland in a Rimac Concept One, an electric super car built in Croatia, during filming for The Grand Tour Season 2 on Amazon Prime, but very fortunately suffered no serious injury.

View photos This video still shows Hammond's car veering off a hillside bendCredit: Nature Pictures/YouTube More

View photos The remains of the car Richard Hammond was drivingCredit: Freuds/PA More

"Richard was conscious and talking, and climbed out of the car himself before the vehicle burst into flames.

"He was flown by Air Ambulance to hospital in St Gallen to be checked over revealing a fracture to his knee.

"Nobody else was in the car or involved in the accident, and we'd like to thank the paramedics on site for their swift response.

"The cause of the crash is unknown and is being investigated."

It was the biggest crash I've ever seen and the most frightening but incredibly, and thankfully, Richard seems to be mostly OK.

— Jeremy Clarkson (@JeremyClarkson) June 10, 2017

View photos Richard Hammond with co-star James May More

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