--File--A Chinese netizen browses the website of Facebook in Shaoyang, central Chinas Hunan province, 23 January 2011.
Chinas internet users have been cut off from accessing all foreign websites for around an hour in an unexplained incident that sparked speculation the countrys censorship system was being tested or further tightened. The great firewall already blocks many sites hosted from other countries, but users in Beijing, Shanghai and other parts of China reported that they could not reach any foreign sites whatsoever on Thursday (Apr. 12) morning - although it was not clear whether the problems were universal. Meanwhile, users abroad and in Hong Kong - which is part of China but not subject to Beijings net censorship - said they were unable to reach any sites on the Chinese mainland.