Gulfiya Khanafeyeva, a silver medallist at the 2006 European Championships, is implicated in a doping case for the third time in her career.

Fellow hammer thrower Maria Bespalova and triple jumper Viktoria Valyukevich have also been retrospectively disqualified.

Weightlifter Khadzhimurat Akkaev is the final athlete sanctioned, from the men's under-105 kilograms event in the British capital.

The two-time Olympic silver medallist has still been sanctioned even though he withdrew from the event anyway with a back injury.

All four failed for banned anabolic steroid turinabol.

The IOC has been re-testing samples from Beijing 2008 and London 2012 using up-to-date technology.

New techniques provided by former Moscow Laboratory director Grigory Rodchenkov, who has since defected to the United States, can detect steroids in the body for far longer.

Khanafeyeva finished 16th in hammer qualifying at London 2012.

The 34-year-old served a three month doping ban in 2002 before a second two year suspension in 2008 for submitting a fake urine sample.

Her mark of 77.26 metres saw her hold the world record for just 12 days in June 2006.

It was eclipsed by team-mate Tatyana Lysenko, the initial London 2012 winner, who has already been disqualified for doping.

Bespalova, already serving a four-year ban after testing positive for a banned steroid in 2015, finished 11th at London 2012. 

Valyukevich, a gold medal winner at the 2005 World Indoor Championships in Madrid, was eighth in the triple jump final at London 2012.

She finished two places in front of Russian team-mate Tatyana Lebedeva, who has already been stripped of Olympic long jump and triple jump silver medals won at Beijing 2008 following positive retests.

Akkaev followed silver at Athens 2004 in the under-94kg division with bronze at Beijing 2008 before stepping-up in weight divisions.

He also won both the world and European under-105kg titles in 2011.