The World Anti-Doping Agency is "very alarmed" after allegations about the "extraordinary extent of cheating" in athletics.
Kenya's Olympic 800m champion David Rudisha suffers a shock defeat at home for the first time as a senior runner.
- 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 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
- Watch video Weightman claims great 1500m win
Best of Bolt
World Athletics Championships
Details of BBC Sport's live coverage of the World Championships in Beijing from 22-30 August.