Bolt pleads with dopers to keep it clean or risk killing athletics

Usain Bolt has warned dopers they risk killing athletics and urged them to clean up their act for the sake of the sport.

The 30-year-old pleaded for clean sport ahead of his final individual 100 metres race at the World Championships this weekend.

Of the 30 best 100m times, 21 were achieved by athletes who have served drugs bans — with the other nine all coming from Bolt during a nine-year career which has earned eight Olympic gold medals and 11 world titles.