After testing positive for a banned drug, British sprinter CJ Ujah has been suspended from competition.
Ujah, 27, was a member of Squad GB's silver-winning men's 4x100m relay team at the Tokyo 2020 Olympics earlier this month.
The Athletics Integrity Unit (AIU) has issued him a provisional suspension.
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A representative for UK Athletics stated the governing body does not comment on ongoing investigations.
Ujah won the 100m in the British Championships in June, but has yet to speak.
In Tokyo, Britain's men's four almost missed out on the 4x100m title by a tenth of a second as anchor runner Nethaneel Mitchell-Blake was passed on the line by Italy's Filippo Tortu, Ujah ran the first leg.
According to the World Athletics Anti-Doping Rules, if an athlete commits an ADRV while competing as part of a relay team, "the relay team shall be automatically disqualified from the event in question, with all resulting consequences for the relay team, including the forfeiture of all titles, awards, medals, points, and prize and appearance money."
The World Anti-Doping Agency's list of prohibited drugs lists Enobosarm, or Ostarine, as an anabolic agent that is always forbidden.