Ukraine's javelin thrower Oleksandr Pyatnytsya has been ordered to return the Olympic silver medal he won at London 2012 after he tested positive following a re-test of his sample.

The 31-year-old finished second at the Games with a throw of 84.51 metres, seven centimetres behind the winner, Trinidad and Tobago’s Keshorn Walcott.

Re-analysis of a sample from the Games, though, has now revealed the presence of the anabolic steroid dehydrochlormethyltestosterone.

The IOC Disciplinary Commission, composed of chairman Denis Oswald, Juan Antonio Samaranch and Uğur Erdener decided to disqualify his result from the men's javelin competition.

Finland’s Antti Ruuskanen finished third in the event and the Czech Republic’s Vitezslav Vesely finished in fourth and are in line to move up the standings to the silver and bronze medal positions respectively.

It has also been announced that Belarus' hammer thrower Pavel Kryvitksi was found to be positive following a re-test from London 2012.

Kryvitksi was found to have had the substances stanozolol and dehydrochlormethyltestosterone in his sample.

He finished 28th.

Weightlifters Hripsime Khurshudyan of Armenia and Turkey's Nurcan Taylan have also been confirmed to have tested positive in the Beijing 2008 re-tests.

The International Weightlifting Federation (IWF) revealed last month that Khurshudyan had failed in the London 2012 re-tests, where she could stand to lose the bronze medal she claimed in the women’s 75 kilogram event.

The IOC have now revealed she also tested positive for stanozolol at Beijing 2008, where she finished in 11th place.

Taylan, the Athens 2004 under 48kg gold medallist, has been confirmed to have failed for stanozolol.

The Turkish lifter failed to record a finish at Beijing 2008.

A total of 98 positives emerged following the re-test of 1,200 samples from Beijing 2008 and London 2012.

Before today, only two of those have so far been officially confirmed and stripped of medals by the IOC.

Both are female weightlifters, Ukraine's under 58 kilograms London 2012 bronze medallist Yulia Kalina and Turkey's under 48kg Beijing 2008 silver medallist Sibel Özkan.

A total of 23 medallists from Beijing 2008 produced provisional adverse analytical findings as a result of a second wave of retests conducted last month, predominantly focused on athletes who reached the podium in the Chinese capital.

The IOC said that the 30 athletes from the Games came from four sports and eight National Olympic Committees.

Two sports were implicated in the 15 positives representing nine countries from London 2012.

The IOC decided at the Olympic Summit in Lausanne last month to extend their re-testing programme of doping samples from Beijing 2008 and London 2012 to include all medal winners.

It expanded on the targeted re-analysis of athletes due to compete at Rio 2016 completed last month.

A total of 30 tests came back positive in the first wave of testing from Beijing and 23 were detected from London.

Initially, 31 athletes had produced positive samples from Beijing 2008 but the B-samples on two tests came back negative, while a further failed test was also recorded.