OSLO • Dafne Schippers was involved in a bizarre women's 200-metre run at the Oslo Diamond League meet on Thursday when the Dutch sprinter false-started, was allowed to race and won, was then disqualified, and then finally reinstated.

The 2015 world champion and Rio Olympics silver medallist's 25th birthday celebrations almost fell flat as she was originally disqualified for a false start.

She was then allowed to run under protest after she signalled to officials that she could not hear the gun due to crowd noise.

She won the race in an impressive 22.31sec before she was disqualified again.

Ivory Coast's Murielle Ahoure was crowned the winner with a season's best 22.74sec before the event took another twist later when Schippers was reinstated on appeal.

Schippers claimed that she had been distracted by a spectator standing up and banging a seat.

"There was a lot of noise at the start and it was difficult to concentrate," pleaded Schippers. "Such races happen sometimes so I must accept it."

However, one hour later, the Diamond League organisers tweeted: "Confirmation: Dafne Schippers reinstated as winner in the 200m with a time of 22.31."

No further explanation was given.

Canadian Olympic bronze medallist Andre de Grasse had a far more straightforward race as he won the men's 100m with his best time of the season.

De Grasse won in 10.01sec, one hundredth of a second ahead of Britain's Chijindu Ujah with Ben Youssef Meite of Ivory Coast third in 10.03sec.

"It felt good, the weather was great, I ran my season best," said de Grasse after winning at the Oslo Diamond League meet for the second year running.

"I hope it will continue in Stockholm (tomorrow) and I will be able to get my sub-10 before the Canadian trials. But for sure I need to improve my start."

REUTERS, AGENCE FRANCE-PRESSE