The crash that left French Formula One driver Jules Bianchi in a critical condition with severe head injures was down to bad luck rather than poor judgement by Japanese Grand Prix race officials, a track spokesman said on Tuesday.

The 25-year-old Marussia driver suffered the life-threatening injury on Sunday when he aquaplaned off a wet track and slammed into the back of a recovery tractor that had been deployed to remove Adrian Sutil's crashed Sauber.

"Officials raised 'double yellow flags' after the accident by Sutil, which means drivers had to slow down to the speed that they can immediately stop, but unfortunately Bianchi's car aquaplaned right at the time and ran into the accident site, which was bad luck," Suzuka Circuit spokesman Masamichi Miyazaki said.