BBC visits China's Xinjiang province - home of the Uighurs
China says it is facing a growing threat from militant Islam and it is in the midst of a year-long crackdown on what it describes as terrorism driven by religious extremism.
The campaign is focused on the western province of Xinjiang, home to China's Uighur ethnic minority who are predominantly Muslim.
Despite doubling the policing budget in the province and jailing hundreds of Uighurs, violent attacks have continued.
Critics say China is exacerbating its problems by religious repression.
Widespread intimidation makes reporting from the region extremely difficult as the BBC's China editor Carrie Gracie reports.