 The rioting was sparked by allegations of sexual assault on Han women by Uyghurs , and rumours of an incident in which two female Han workers were sexually assaulted by six Uyghur co @-@ workers at the factory , according to Voice of America . The authorities said that the rumours were false , and had been initiated by a <unk> former co @-@ worker . Xinhua said that a man <unk> Zhu " <unk> the information to express his discontent " over failing to find new work after quitting his job at the factory . 
