Mo Farah quizzed for five hours by USADA

British sprinter Mo Farah was questioned for five hours by the US Anti-Doping Agency (USADA) as a part of investigation regarding claims of breach of anti-doping rules by his coach Alberto Salazar.

The Double Olympic champion, who won the 3,000metres at the Anniversary Games at the Olympic Stadium on Friday, was interviewed for five hours by USADA lawyer Bill Bock, the BBC reported.

The 32-year-old athlete, who took seven minutes 34.66 seconds to complete the race, was running his first race in London since doping allegations were levelled against Salazar. Farah was given a jubilant reception as he cruised to victory in London on Friday.

The Briton has come under heavy scrutiny after an investigation alleged that Salazar, who was hired as Farah's coach in 2011, doped United States 10,000 metre record holder Galen Rupp in 2002, when the athlete was 16 years old.

Although American coach Salazar had denied these allegations, Farah insisted that his coach would soon be providing evidence to make this clear.

Last month, an 'emotionally and physically drained' Farah had pulled out of a Diamond League meeting in Birmingham.