The Malaysian MotoGP at Sepang has been stopped on the second lap after Marco Simoncelli fell and was hit by Colin Edwards and Valentino Rossi.
Simoncelli's helmet was knocked off in the incident, which occurred when he lowsided from his Gresini Honda at turn 11.
The Italian's bike then regained partial grip, pulling him back across the track and straight into the path of Edwards and Rossi.
Simoncelli, who was motionless on the track after the impact, had been fourth at the end of lap one.
Edwards also fell but escaped serious injury, while Rossi was able to return to the pits.
The race was immediately red flagged.