Russia's Olympic and double world hammer throw champion Tatyana Beloborodova has been provisionally suspended for doping.
Beloborodova, who previously competed under her maiden name Lysenko, won world titles in 2011 and 2013 and Olympic gold at London 2012.
Russia's state media is reporting a sample she gave at the 2005 world championships was positive after a retest.
The 32-year-old was suspended from 2007 to 2009 for using steroids and a second positive test could lead to a lifetime ban.
