China violence: Ethnic tension in Xinjiang province
29 April 2013 Last updated at 05:43 BST
China's president has said there should be "no mercy for terrorists" after an outbreak of violence this week which left more than 20 people dead.
The violence in the remote Xinjiang province has highlighted simmering tensions between its indigenous Muslim people - who number some 10 million - and the central government.
It follows widespread rioting in 2009 which killed nearly 200 people in the province.
The BBC's Beijing Correspondent Damian Grammaticas has been to the scene of the latest violence.