体坛英语新闻：Former world champion Montsho fails doping test

GLASGOW, Aug. 2 (Xinhua) -- Former world champion Amantle Montsho has failed a doping test following her fourth finish at the women's 400m at the Commonwealth Games Glasgow 2014 on July 29, organizers said on Saturday.

The A sample of Botswana's Montsho tested positive for banned stimulant methylhexaneamine. Her B sample will be tested on Monday in London.

The 31-year-old Montsho won the title at the World Championships in Daegu in 2011 and also took the event at the Commonwealth Games at Delhi in 2010. Both golds were her country's first at a Commonwealth Games and World Championships respectively. She also won silver at the 2013 World Championships in Moscow.

The 16-year-old Nigerian weightlifter Chika Amalaha was stripped of her gold medal after her A and B samples tested positive for banned substances.