The Singapore Grand Prix had to be neutralised behind the safety car after a man walked on the track.

With Sebastian Vettel leading, the Ferrari driver radioed in to his team on lap 37 to say there was a person on the circuit, with the safety car immediately being deployed. Cameras picked up the man walking along the Esplanade Bridge, facing the direction of the oncoming cars as he headed towards Turn 13.

The man had yet to be approached when he climbed back through a gap in the fencing, allowing the race to restart.

It is the second occasion a person has been on the circuit this season, with a man running across the pit straight during FP2 at the Chinese Grand Prix in April, climbing the pit wall and walking in to the garages. On that occasion it was confirmed a Chinese fan ran in to the Ferrari garage wanting to try one of the cars, eventually being arrested by police.

Click here for some of the most memorable crashes at Singapore

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Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.

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