Thirty one people have been killed in the explosive attack in the capital of China's Xinjiang region, state news agency Xinhua News reports.
Social media users have been used Weibo to post images from the scene. There has been no official death toll or confirmation from the Chinese authorities.
This Weibo photo shows the explosion scene in the capital area of China's Xinjiang region. http://t.co/dEsBkKEJYu
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America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.