Usain Bolt stormed to the World Championship sprint double but a  runaway segway proved more problematic.  

A TV cameraman was trailing Bolt's celebrations when the wheel of his segway rolled up on to a camera track, changing the vehicle's direction and taking the sprinter out from behind.

There was an audible gasp inside the Bird's Nest as the double gold medallist was wiped out, but he quickly composed himself and allayed fears of any lasting impact afterwards.

"It didn't actually hit me in my Achilles, it hit me in my calf area," Bolt confirmed to Press Association Sport. "It's alright, I will get over it.

"Never a doubt (for the relays), never a doubt. I am just going to get it massaged, ice it up a bit and I should be fine." 

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