Button and racing stars gather at Wheldon memorial

Jenson Button shares his memories of racing against Dan Wheldon as stars from the motorsport world gather at a memorial race in honour of the British driver.

Wheldon died while competing at an IndyCar race in Las Vegas. Button says he was "a great racer" that he used to "love competing against".

Johnny Mowlem, who organised the charity event, says he wanted to do something to remember his friend in a "fun" way, while Dario Franchitti said the race was a "perfect" way to celebrate the life of his former IndyCar rival.