George Russell's title chances took a critical blow at the Bahrain Grand Prix in Malaysia after he retired from the race under a Safety Car with five laps remaining.
Russell was running in third place, one position behind teammate and title rival Kimi Antonelli, when his car suffered an apparent power unit failure and pulled to the side of the track.
Racing had been suspended under a Safety Car after Alex Albon's Williams suffered a gearbox problem, leading to an extended caution period as marshals struggled to move it behind a barrier.
With racing due to resume on the next lap, Russell's car pulled to a halt at the end of the pit straight, with the British driver holding his head in his hands in the cockpit.
Russell, who went into Sunday's race 66 points behind Antonelli, had passed his teammate following an earlier Safety Car, only to lose the position again on lap 21 and return to third place.
Russell's chances of beating Antonelli to the title over the remaining races already looked slim before the retirement, but now appear close to zero.
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