Former sprinter Usain Bolt is no longer a nine-time Olympic champion after he was stripped of his 2008 relay gold medal.

The decision came about as a result of a doping case involving then-team-mate Nesta Carter, causing Jamaica to be stripped of the gold medal won by the men's 4x100-metres relay team at the Games in Beijing.

Bolt had thought he'd won the so-called "triple treble" of winning three sprint events at three Games with his success in Rio last year, but is now down to eight golds in total.

The Jamaican won the relay alongside, Michael Fraser, Asafa Powell and Carter almost a decade ago.

The decision came after Carter was found to have tested positive for methylhexaneamine, a banned substance.

Carter's was one of 454 selected doping samples re-tested by the International Olympic Committee (IOC) last year.

The relay title in Beijing completed the first of Bolt's three gold medal sweeps in the 100, 200 and relay at three straight Olympics.

Trinidad and Tobago is in line to get the gold medal from 2008, Japan could be upgraded to silver, and fourth-place finisher Brazil could get the bronze medal.

The IOC's ruling states that Carter noted he was taking supplements in 2008 "advised in this respect by his coach, Mr. Stephen Francis."

The verdict added: "The athlete explained that he had given several samples for doping controls whilst he was taking Cell Tech and Nitro Tech before the 2008 Olympic Games and he had never tested positive for a prohibited substance.

"He therefore did not believe that these supplements could contain prohibited substances. He did not understand how methylhexaneamine could have been found in 2016."

Carter can appeal the decision to the Court of Arbitration for Sport.

More follows...