The high-speed crash that Top Gear star Richard Hammond was lucky to survive was probably caused by a nail in his tyre that wasn't spotted, the BBC says.
The 38-year-old suffered serious head injuries when the jet-powered car he was driving for a stunt on the show crashed after one of its tyres burst.
A BBC report blames the crash on the fact that no-one noticed the tyre was damaged before the final run.
It said checking the car between runs may have spotted the danger.
Richard Hammond has made a complete recovery since the crash
The BBC's 88-page report said the company that provided the jet-powered car was responsible for the car's safety.
But it criticised the Top Gear team for not having anyone to make sure the company's safety checks were good enough.
Hammond had to be cut free from the car after it spun off the runway and flipped over at an airfield in York last September. Doctors thought he'd be in hospital for months, but he was let out within weeks and has since made a complete recovery.