Rumors have abounded in Urumqi of recent syringe stabbers trying to spread AIDS and other diseases.
CNN: Chinese doctors say some claims of needle-stabbings are mistaken
Heavily armed troops remain on the streets of Urumqi and curfews are in effect.
Xinjiang's economy has been growing at double-digit rates, yet Urumqi still erupted with violence in 2009.
They were ready to shoot protesters to quell unrest among ethnic Uighurs in Urumqi in Xinjiang in 2009.
Large-scale violence flares occasionally in other cities in Xinjiang, but Urumqi, the region's capital, had previously been calm.
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The Urumqi Public Prosecutors Office on Saturday said four ethnic Uyghurs were arrested in connection with three syringe-wielding incidents.
CNN: Chinese doctors say some claims of needle-stabbings are mistaken
The proximate cause of the rioting in Urumqi on July 5 happened thousands of miles away in Guangdong province.
But five major mosques near the center of Sunday's violence in Urumqi, the capital of Xinjiang, were closed Friday morning, Xinhua said.
Migrant workers are everywhere: girls from Anhui serve in Urumqi restaurants, and tough, tiny Hunanese put up pylons high in mountain passes.
Facebook was once available in China, but was blocked in July 2009 after riots in the Urumqi ethnic minority region of the country.
The previous large outbreak of unrest, an explosion of inter-ethnic violence in July 2009 in Urumqi, the regional capital, left some 200 dead.
This is the latest crisis plaguing Xinjiang province and its capital city of Urumqi, where tensions have boiled over between Uyghurs and Han Chinese.
CNN: Chinese doctors say some claims of needle-stabbings are mistaken
The rioting by Uighurs in Xinjiang's capital Urumqi in early July has put the spotlight back on China's handling of its ethnic minority regions.
Complaining that the authorities were not doing enough to protect their compatriots, Uighurs took to the streets of Urumqi in an initially peaceful protest.
Ethnic Uyghurs have been blamed for the alleged syringe stabbings, and demonstrators clashed with police in Urumqi for two days this week over the issue.
CNN: Chinese doctors say some claims of needle-stabbings are mistaken
Chinese security presence across the region has increased dramatically since 2009, when interethnic clashes in the regional capital of Urumqi left nearly 200 people dead.
WSJ: Chinese Authorities Raise Death Toll in Xinjiang Violence
In September, we were in Urumqi, China, near the Kazakhstan border.
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Uyghurs protested in Urumqi, hundreds of miles from the toy factory.
B-carrying university students in Urumqi, expelled from their colleges last year.
Upon graduating from high school, Doug took a two-week trip across China from Beijing to Urumqi by train alone and in a hard seat no less.
The G30 is the longest road in China, running for 4, 400km (2, 700 miles) from the coast of eastern Jiangsu province to Urumqi, close to the Kazakhstan border.
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Hu met with military personnel, hospital workers, local officials and religious leaders and with the widow of a policeman who was killed July 5 by rioters in Urumqi.
The authorities in Urumqi, however, have dug in their heels.
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Hundreds of Han Chinese were on the streets of Urumqi on Tuesday, holding sticks and pipes, and calling for severe punishment of the Uyghurs, who they say committed serious crimes.
Hundreds of Han Chinese were on the streets of Urumqi last Tuesday, holding sticks and pipes and calling for severe punishment of the Uyghurs, who they say committed serious crimes.
Access has been blocked not only in Urumqi but elsewhere in Xinjiang, including the city of Kashgar, where police peacefully dispersed a demonstration of at least 200 Uighurs on Monday.
Despite the fear of many of Urumqi's Hans that the attackers might be trying to spread HIV, there has been no word that officials have detected any poison or harmful viruses.
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