Chinese swimming star Ye Shiwen denies doping
A young Chinese swimmer who won a gold medal in an outstanding performance at the Olympics has categorically rejected suggestions of doping.
Ye Shiwen - who is 16 - shaved more than a second off the world record in the women's 400 metre individual medley record.
A leading American swimming coach has said her performance was "impossible".
She has since taken another gold medal, breaking the Olympic record in the 200 metre individual medley.
David Bond reports.
17 Jan 2013