(BSS/AFP) - Two motorcycle racers died and another was seriously injured in an 11-bike crash during a British Supersport event on Monday, organisers said.

Englishman Owen Jenner and New Zealander Shane Richardson were fatally injured in the pile-up on the first lap of the race at Oulton Park in the northwest of England.

The race, a support event to the British Superbike Championship, was halted and the rest of the day`s race programme cancelled.

Another English rider, Tom Tunstall, sustained "significant injuries" in the crash, said a statement on Monday night from circuit organisers Motorsport Vision Racing (MSVR).

"Owen Jenner, 21, was initially treated trackside and then taken to the circuit medical centre, where despite further resuscitation treatment he died from a catastrophic head injury," MSVR said.

"Shane Richardson, 29, was initially treated trackside and then taken to the circuit medical centre before being transferred to Royal Stoke University Hospital with severe chest injuries. He died prior to arrival.

"Tom Tunstall, 47, was initially treated on the track and was taken to the circuit medical centre. He was later transferred to Royal Stoke University Hospital with significant back and abdominal injuries."

Riders Carl Harris, Max Morgan, Cameron Hall, Freddie Barnes and Morgan McLaren-Wood were treated for minor injuries at the circuit medical centre.

Lewis Jones, Corey Tinker and George Edwards were also involved in the accident but walked away unscathed.