Footage of the moment that Fernando Alonso stopped to give Mark Webber a lift following the Singapore Grand Prix has revealed why stewards took the decision to hand both drivers a reprimand, which in turn will see Webber take a ten place grid penalty in Korea.

Webber had retired from the race on the final lap when the engine in his Red Bull let go, forcing him to park up at turn seven.

The Australian then flagged down Alonso on the slowing down lap and received a lift back to the pits, although both drivers were then reprimanded for their actions afterwards.

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For Webber, it was a third reprimand of the season, which automatically triggers a ten place grid drop for Korea.

While the decision to hand out a penalty has been largely derided by fans, the release of the CCTV footage used by stewards to make their decision has now shown exactly why the penalty was given.

The footage shows Webber running onto the circuit as Alonso stops on the racing line, with the two Mercedes cars behind forced to take avoiding action.

Lewis Hamilton had admitted to being shocked at coming across the stationary Ferrari on the circuit, with the Briton able to avoid a repeat of the post-race crash that saw Fabio Leimer and Alex Rossi collide after the GP2 sprint race earlier in the evening.