(Reuters) -Supersport riders Owen Jenner, 21, and Shane Richardson, 29, died after a crash involving 11 bikes at the start of a race at Oulton Park on Monday, circuit owners Motor Sport Vision (MSV) said.
Tom Tunstall, 47, was in hospital with significant back and abdominal injuries and a further five riders were taken to the medical centre with minor injuries at the circuit in northern England.
The race was stopped immediately after the chain-reaction crash at the exit to turn one on the opening lap, with the British Superbike championship event then cancelled.
MSV said British rider Jenner was treated trackside initially but died from a catastrophic head injury after being taken to the circuit medical centre.
New Zealander Richardson was also treated trackside and then at the medical centre but died with severe chest injuries prior to arrival at Royal Stoke University Hospital.
MSV said it and the Motorcycle Circuit Racing Control Board were investigating along with the coroner and police.
(Reporting by Alan Baldwin in London, editing by Pritha Sarkar)
