Women's hammer gold medallist Zhang Wenxiu of China has failed a doping test at the Asian Games and has been thrown out of the competition, the Olympic Council of Asia (OCA) announced on Friday.

The OCA said she had tested positive for the banned substance Zeranol.

Zhang becomes the sixth competitor to test positive at the Games, which end on Saturday.

Image: China's Zhang Wenxiu holds her national flag after winning the women's hammer throw final at the Incheon Asiad Main Stadium on Sunday.

Photograph: Jason Reed/Reuters