5 August 2012 Last updated at 20:24 GMT

Olympics athletics: Christine Ohuruogu wins 400m silver

Great Britain's Christine Ohuruogu

Cannot play media. Sorry, this media is not available in your territory.

Great Britain's Christine Ohuruogu produces a powerful finish to win the silver medal in the 400m at the London 2012 Olympics.

Sanya Richards-Ross of the US won gold, with compatriot DeeDee Trotter taking bronze.

Watch the Sunday's athletics on BBC Sport's Interactive Video Player.

Available to UK users only