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British sprinter Chijindu Ujah. Ujah is among four athletes who have been suspended for allegedly breaching anti-doping rules at the Tokyo Olympics.Matthias Hangst/Getty Images AsiaPac

Britain’s Olympic 4x100-metre relay silver medalist Chijindu Ujah has been provisionally suspended for allegedly breaching anti-doping rules at the Tokyo Games, the Athletics Integrity Unit said on Thursday.

Three other track and field athletes who were suspended during the Games – Moroccan-born Bahraini 1,500-metre runner Sadik Mikhou, Georgian shot putter Benik Abramyan and Kenyan sprinter Mark Otieno Odhiambo – were also listed.

The AIU said in a statement it had been notified by the doping-control laboratory in Tokyo after the Games that Ujah had returned an adverse analytical finding from a test carried out during the Olympics.

It listed the prohibited substances detected as Ostarine and S-23, both classified by world anti-doping organization WADA as a selective androgen receptor modulator with effects similar to anabolic steroids, which help in building muscle.

Ujah was part of the British quartet, alongside Zharnel Hughes, Richard Kilty and Nethaneel Mitchell-Blake, who finished second to Italy in a close race. Before the Games, Ujah said Zen Buddhism and meditation helped him regain his calm, his confidence and his form of previous years.

If found guilty, Ujah and the British team could be stripped of the silver medal.

That would mean the Canadian team of Aaron Brown, Jerome Blake, Brendon Rodney and Andre De Grasse could see their medal upgraded from bronze to silver. China would be moved up to bronze, from the fourth position.

The AIU said it had worked closely with the International Testing Agency during the Games and provided the intelligence to carry out specific target testing on two of the four athletes, without specifying which.

“The AIU now awaits the conclusion of the ITA proceedings against the above athletes, which will determine whether any anti-doping rule violations have been committed and what consequences [if any] should be imposed in relation to the Olympic Games,” it added.

It added that it had been notified of another AAF for Odhiambo in a sample collected in South Africa on June 24, before the Games started.

The Anti-Doping Agency of Kenya has handed over the case management responsibility to the AIU.

Odhiambo, a 100-metre sprinter, was suspended before the qualifying heats in Tokyo.

Mikhou was suspended for receiving a blood transfusion during the Games.

Abramyan failed an out-of-competition dope test for steroids in Tokyo.

With a report from The Associated Press

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