Lightning Bolt strikes gold: Usain storms to 100m glory and he answers his critics with resounding victory in 9.63 seconds
Jamaican sprinter Usain Bolt defends his sprint title by setting an Olympic record time at London 2012.

Fellow Jamaican Yohan Blake came second to claim silver in a time of 9.75 seconds.
American Justin Gatlin, who served a four-year ban for doping, took the bronze in 9.79 seconds.
Bolt's run was the second-fastest ever. He already holds the world record of 9.58 seconds.