Mo Farah's coach Alberto Salazar may have breached drug rules – leaked Usada report

Salazar (centre) celebrates with Mo Farah and Galen Rupp after the pair took gold and silver in the 10,000m final at the London 2012 Olympics

The American coach of Olympic champion Mo Farah may have broken anti-doping rules to boost the performance of some of his athletes, says a leaked report.

Alberto Salazar has been under investigation since a BBC Panorama programme made allegations about drugs use at his US training base.

A leaked US Anti-Doping Agency (Usada) report, dated March 2016, has been obtained by the Sunday Times.