Usain Bolt and Jamaican relay quartet thank London crowds
Jamaican Usain Bolt says it is "a wonderful feeling" to have successfully defended all three of his Olympic sprint titles.
Nesta Carter, 4x100m relay gold medallist says the Jamaicans were aiming for a world record but Bolt says they could have gone faster.
The team of Usain Bolt, Yohan Blake, Nesta Carter and Michael Frater cruised to gold in the men's 4x100m relay in a world record time of 36.85 seconds.
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