Mariana Pajon earned Colombia their first gold medal of the London Games when she thundered to victory in the women's BMX event on Friday.

Pajon, who had dominated her three semi-final runs in awe-inspiring fashion, led the eight-rider strong field after the first bend and never looked back.

New Zealand's Sarah Walker took silver and Dutchwoman Laura Smulders claimed bronze while local hope Shanaze Reade settled for sixth.

She finished just behind Caroline Buchanan of Australia, the BMX time trial world champion.