Teenage Formula Four driver Billy Monger loses legs after horror crash at Donnington Park

British Formula Four driver Billy Monger has had his lower legs amputated after an horrific crash at the Donington Park circuit on Sunday, series organisers said.

The 17-year-old, who smashed at speed into the back of another car that had halted on the track, was trapped in the wreckage for more than 90 minutes before being extricated and flown to hospital.

Teenage Formula Four driver in horror crash

"Due to the injuries sustained and despite every effort, Billy has sadly had both lower legs amputated," the FIA sanctioned series said in a statement on Wednesday.

"He has been kept in an induced coma while undergoing surgery, from which he is expected to be woken in the next few days."

A crowd-funding site was set up to raise funds for the teenager's medical treatment and recovery, with Formula One drivers joining the motorsport community in expressing support on Twitter.