Usain Bolt captured a third gold medal and a third world record after Jamaica claimed men's 4x100m relay gold.
The quartet smashed the previous world mark of 37.40 seconds set by the United States at the 1992 Olympics by a huge margin to set a new benchmark of 37.10.
Nesta Carter ran a strong first leg before passing the baton to Michael Frater, who handed on to Bolt before Powell brought it home.
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