Government measures are taken to prevent a repeat of deadly clashes in the northwestern city of Urumqi, where unrest pitted Uighurs, a long-aggrieved Muslim minority, against the majority Han Chinese. With closed-circuit cameras keeping an Orwellian eye on Urumqi's buses, markets and back alleys, along with thousands of paramilitary on patrol, and a fresh infusion of economic aid, China managed to slide through the dreaded one-year anniversary of the worst ethnic violence in its recent history without incident.