According to the IAAF false start rule, except in combined events, any athlete responsible for a false start shall be disqualified.

While in combined events only one false start per race shall be allowed without disqualification of the athlete(s) responsible for the false start. Any athlete(s) making further false starts in the race shall be disqualified from the race.

The combined events refer to the heptathlon for women, and the decathlon for men.

Bolt's disqualification marked a dramatic ending to his ambition to snatch another sprint double in the 100m and 200m, after his legendary wins in Berlin two years ago.

At the Berlin World Championships, he created the world records in the 100m and 200m, 9.58sec and 19.19sec, respectively.

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