Huge pile-up on BMX track

A massive pile-up in the first run of heat three of the men's BMX quarter-final results in an easy victory for New Zealand's Marc Willers.

A crash on the first banked turn brought down all the riders apart from Willers.

Manuel De Vecchi of Italy eventually rolled home in second place.

Watch a full replay of the men's BMX quarter-finals on the BBC Sport interactive video player.

Available to UK users only.

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