Usain Bolt wins relay gold for Jamaica at World Championships

Usain Bolt wins his third gold of the World Athletics Championships by leading home Jamaica in the 4x100m relay - but Great Britain throw away their chance of a medal on the final baton change.

In a race littered with mistakes, the United States were disqualified, leaving China to win silver and Canada to take bronze as Jamaica cruised home in 37.36 seconds.

Great Britain were in medal contention until James Ellington failed to get the baton to CJ Ujah for the final leg.