Britain's Lewis Hamilton won a wet Japanese Formula One Grand Prix on Sunday to complete a hat-trick of victories and extend his championship lead over Mercedes teammate Nico Rosberg to 10 points with four races remaining.

Rosberg finished second in a race that needed two starts behind the safety car and ended before the full distance due to a crash that saw Marussia's French driver, Jules Bianchi, rushed to hospital.

"The driver is not conscious and has been sent to the hospital by the ambulance because the helicopter cannot fly in these conditions. Further updates will follow but for the moment we cannot say anything" FIA head of communications, Matteo Bonciani, said.