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.

The leaked report also alleged Salazar routinely gave Farah and other athletes prescription drugs with potentially harmful side-effects without a justifiable medical reason.

all from - www.bbc.co.uk/sport/athletics/39097761