Three Russian athletes have been disqualified from the 2012 Olympics after failing doping retests, the country's track federation has said.
Hammer throwers Maria Bespalova and Gulfia Khanafeyeva, and triple jumper Viktoria Valyukevich were all disqualified. None of them were medalists.
The disqualifications of Bespalova and Khanafeyeva mean all three Russian women who competed in the hammer throw in 2012 have tested positive for doping. Tatyana Lysenko was the original winner, but was stripped of her gold medal in October.
Valyukevich, a former European indoor champion, was eighth in the triple jump at the 2012 Olympics and finished two places ahead of Russian teammate Tatyana Lebedeva, who has been stripped of two medals from the 2008 Beijing Games for doping.
Russian officials didn't say which substances were involved in the latest doping retests.
It is the third time Khanafeyeva, who won European championship silver in 2005, has been found guilty of a doping offense. She previously served bans in 2002 for a positive test and in 2008 for providing someone else's urine in a drug-test sample.
Bespalova is currently serving a four-year ban after testing positive for a banned steroid in 2015.