Mo Farah's trainer rejects allegations he broke anti-doping rules

Alberto Salazar (centre) celebrates Sir Mo Farah (right) winning gold in the 10,000m final at the London 2012 Olympics with team mate and silver medalist Galen Rupp (left)

The American coach of Olympic champion Mo Farah rejected claims he may have broken anti-doping rules to boost the performance of some of his athletes.

Alberto Salazar has been under investigation since a BBC Panorama programme in 2015 made allegations about drugs use at his US training base, and a leaked report from the US Anti-Doping Agency (Usada) was obtained by the Sunday Times this weekend.