Doping in sport: Athletics body IAAF 'suppressed' doping study

Athletics' governing body has been accused of suppressing a study which showed as many as a third of the world's top athletes admitted violating anti-doping rules.

In a statement to the UK's Sunday Times newspaper, Germany's University of Tubingen said the International Association of Athletics Federations (IAAF) had delayed publication "without good reason".

The IAAF said discussions were ongoing about the report's publication.

Richard Conway reports.