Valerie Adams of New Zealand will now take gold and Evgeniia Kolodko of Russia will get silver. Fourth-place finisher Gong Lijiao of China moves up to bronze.
The International Olympic Committee said that Ostapchuk tested positive for the steroid metenolone. She won the shot put exactly a week earlier.
The IOC says she was tested the day before her competition and again following the event. Both samples were positive.
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The announcement came hours after the flame was extinguished at the closing ceremony with athletes and officials heading out of London.

