Fellow American Kerron Clement retained his men's 400m hurdles crown with a world best for the year of 47.91 seconds.

BBC: Bolt storms through to 200m semis

American Kerron Clement will start favourite for the final after winning the first semi-final in 48.00, with the great Felix Sanchez also qualifying in 48.34.

BBC: Ohuruogu and Idowu reach finals

Kerron Clement of the United States took gold in the men's 400m hurdles with a time of 47.91, ahead of Puerto Rico's Javier Culson (48.09) and American Bershawn Jackson (48.23).

BBC: Idowu wins Britain's second gold

Jones looked impressive, holding off the challenge from Priscilla Lopes-Schliep of Canada, to win the women's 100m hurdles in 12.63, while Jackson recorded 48.66 to beat fellow American Kerron Clement in the men's 400m.

BBC: Asafa Powell clocks 9.81 to win 100m in Doha

As athletes continue to arrive in London, Coe said he was satisfied with the early stages of the Olympic operation, despite American hurdler Kerron Clement complaining that his bus got lost on the way to the Olympic village.

CNN: British weather posing Olympics challenge, admits Coe