From the Voice of America:
China's Internet minders are scrubbing social networks for references about a heavily populated county in the south of the country's volatile and remote region of Xinjiang, following reports of a major outbreak of unrest.
Some of the scrubbed postings from China's social media that can be seen on the website Freeweibo.com say Shache County in Xinjiang's southern Kashgar Prefecture has been hit by up to at least "four violent terrorist attacks."
While the reports of unrest have yet to be confirmed, sources tell VOA that the county has been locked down and that no one is being allowed to enter.
This is extremely unusual handling even by the PRC's standards of censorship and control.