An Uighur boy shaves the head of a customer in a barber shop after Friday prayers in Yarkand, in the region of Xinjiang April 4, 2008. China is on guard against unrest in the region, home to its ethnic Uighur minority, a Muslim Central Asian people, following a demonstration in the Xinjiang town of Hetian and after widespread protests in Tibet. REUTERS/Nir Elias (CHINA)