LONDON -- Britain's anti-doping agency says it is investigating claims that American long-distance running coach Alberto Salazar encouraged athletes at the Nike Oregon Project to skirt anti-doping rules.

The U.S. Anti-Doping Agency is already looking into the claims.

U.K. Anti-Doping says in a statement it is gathering information following allegations made by former Salazar assistant Steve Magness and former Salazar runner Kara Goucher about the coach in a story by American investigative website ProPublica and the BBC this month.

Salazar has published a 12,000-word letter online disputing the allegations, saying the Oregon Project he leads "will never permit doping."

Salazar coaches double Olympic champion Mo Farah of Britain, and is a consultant for British Athletics.