LONDON — Shot putter Nadzeya Ostapchuk of Belarus became the first athlete to be stripped of a medal at the London Olympics after her gold was withdrawn Monday for doping.

Valerie Adams of New Zealand was awarded the gold and Evgeniia Kolodko of Russia was bumped up to silver. Fourth-place finisher Gong Lijiao of China was moved up to bronze.

The International Olympic Committee said Ostapchuk tested positive for the steroid metenolone. She won the shot put exactly a week earlier. The IOC said she was tested the day before her competition and again following the event. Both samples were positive.

“The (Olympic committee) of Belarus is ordered to return to the IOC, as soon as possible, the medal, diploma and medallist pin awarded to the athlete in relation to the above-noted event,” the IOC said in a statement.

The announcement came hours after the flame was extinguished at the closing ceremony with athletes and officials heading out of London. A day earlier, IOC President Jacques Rogge had proclaimed the fight against doping a success.