Nigerian sprinter Blessing Okagbare is out of the Tokyo Olympics after being handed a provisional doping ban on the day of her 100 metres semi-final.
The Athletics Integrity Unit announced that Okagbare had "tested positive for human growth hormone" in an out-of-competition test on July 19.
That resulted in a mandatory suspension, coming on the day that Okagbare was due to race in a semi-final in Tokyo.
Okagbare finished first in her heat for the women's 100m on Friday, recording a time of 11.05 seconds to beat Britain's Asha Philip and Tynia Gaither of the Bahamas.
That put the 32-year-old into a third consecutive Olympic semi-final.
Okagbare, who won Olympic silver in the long jump in Beijing 13 years ago, holds the Commonwealth Games record in the women's 100 metres, set in Glasgow in 2014.
