American coach Alberto Salazar has again denied allegations of doping made by the BBC, which he previously said had adversely affected his Olympic medallists Mo Farah and Galen Rupp.
An investigation by the BBC television programme Panorama in association with American website ProPublica alleged that Salazar had given Farah's training partner Rupp the banned anabolic steroid testosterone.
But the Cuban-born coach, who has worked as a consultant to UK Athletics for two years, wrote in an open letter published on Wednesday: "I believe in a clean sport and hard work and so do my athletes.
"I will never permit doping. At no time do we use science in violation of the WADA code. We strictly adhere to competition and anti-doping rules at all times.
"I have not and will not condone any athlete I train using a banned substance and would never encourage any athlete to use a banned substance. We have worked very, very hard to achieve our successes and are proud of our accomplishments."
Briton Farah, 32, won the 5,000m and 10,000m double at the London 2012 Olympics. American Rupp, 29, took the silver medal in the 10,000m.
Of the allegations, Salazar said: "At best they are misinformed. At worst, they are lying," and he called upon the BBC and American-based investigative journalism organisation ProPublica to withdraw them.
"At best they are misinformed. At worst, they are lying" - Alberto Salazar
"I told both media outlets that their stories contained false information before they were published. I have now offered evidence that they are false," he said.
"I hereby demand the BBC and ProPublica immediately publish a retraction of their false statements."
Salazar's statement, almost 12,000 words long, dealt with each allegation specifically and in detail.
Panorama alleged that Salazar was involved in doping Rupp when the American was only 16 years of age.
However, Salazar pointed to Rupp's previously disclosed allergy and breathing issues, saying: "Galen has never taken a banned substance in violation of the WADA Code.
"Claims made around Galen's prednisone use are false. Claims made around Galen's use of TUEs (theraputic use exemptions) and manipulation of the TUE system are false.
"Galen has only received two TUEs in his running career since 2010.
"Galen is one of the hardest working, most honest and genuine athletes I have ever known. Galen has never taken a banned substance in violation of the WADA Code."
