LAUSANNE, Switzerland (AP) — A Turkish boxer and a Russian cyclist have been provisionally suspended after doping samples from the 2012 London Olympics came back positive in retesting.

Boxer Adem Kilicci and track cyclist Yekaterina Gnidenko both tested positive for steroids, the governing bodies of their sports said Thursday.

Kilicci, who lost in the quarterfinals of the middleweight division in London, and the Turkish boxing federation have been notified of the findings and his suspension.

The Turkish Olympic Committee said it was "extremely disappointed" by Kilicci's positive test.

"We will now follow the official procedure and will announce appropriate action in due course," the committee said in a statement. "In the meantime, we are redoubling our efforts to encourage more rigorous testing in parallel with greater education of all athletes and their entourages throughout Turkish sport."

Gnidenko competed in the women's sprint and keirin at the 2012 Games without winning a medal, though she now faces being stripped of her keirin silver medal from the world championships later that year.

Gnidenko was a late substitute in the 2012 Olympic sprint after Russian teammate Viktoria Baranova failed a doping test and was expelled from the games.

The IOC has retested stored samples from London and the 2008 Beijing Games, targeting athletes who could compete in this year's Rio de Janeiro Olympics. AIBA said Kilicci had qualified for Rio, while Gnidenko is not listed on the Russian national team squad list for this season.

The IOC reported last week that it had recorded 23 positives from London and 32 from Beijing.

AIBA said it is working with the World Anti-Doping Agency "to ensure that boxing is doping free."

The International Cycling Union said in a statement that Gnidenko's case "is the only positive the IOC passed on to us from the Beijing and London batches."

The Russian Olympic Committee said eight of its athletes were among the 23 positives from London identified by the IOC from London. Another 14 Russians were among the 32 caught in Beijing retests, including 10 medalists named by state TV.

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This story has been corrected to show that Gnidenko won silver at the world championships in 2012, not the European championships.