The International Olympic Committee will act with "zero tolerance" should allegations of widespread doping in athletics be proven.
Jessica Ennis-Hill's coach asks why the IAAF did not act on data appearing to expose widespread doping in athletics.
- Coe wants 'robust' doping response
- Rudisha suffers first loss in Kenya
- No wrongdoing by Farah - UK Athletics
- Briton Waite fails in Worlds appeal
- Rutherford wins Stockholm long jump
- 'I lost all honour in gender case'
- Wales Bundy-Davies targets Worlds medal
- Ennis-Hill in GB squad for Worlds
- Chand wins appeal over hormone ban
- Disability Sport Hermitage & Hahn improve world marks
- Watch video Asher-Smith makes 100m history
- Farah quizzed over Salazar claims
- Farah prepared for 'heavy' training
- Asher-Smith sets GB 100m best
- I am still world number one - Bolt
- Farah roared on to London victory
- Watch video Usain Bolt dances behind BBC's Colin Jackson
Athletics Video & Audio
- Watch video 'I run to inspire my daughter'
- Watch video Proctor sets British long jump record
- Watch video Amos beats Rudisha in men's 800m
- Watch video GB men clinch 4x100m relay victory
- Watch video Bolt wins 100m in 9.87 seconds
- Watch video Farah eases to 3,000m London win
- Watch video Ennis-Hill's 'phenomenal' run
- Watch video Hughes powers to 200m win in London
Best of Bolt
World Athletics Championships
Details of BBC Sport's live coverage of the World Championships in Beijing from 22-30 August.