Turkish runner Elvan Abeylegesse has been banned for doping and stands to lose two Olympic silver medals.
The IAAF says Abeylegesse tested positive for the banned steroid stanozolol in a retest of a sample she gave at the 2007 world championships.
She has been banned for two years and had her results wiped out from 2007-09.
Abeylegesse won Olympic silver medals in the 5000 and 10,000 meters at the 2008 Beijing Games and silver in the 10,000 at the 2007 world championships.
The IAAF also said it had imposed a four-year ban on another Turkish runner, Gamze Bulut, for a violation of its biological passport program. Bulut won silver in the 1500m at the 2012 London Olympics.
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