Chinese paramilitary police officers patrol near the People's Square after they closed down the road leading to the square in Urumqi province, Xinjiang, China, Friday, Sept. 4, 2009. Thousands marched through this city in western China after a series of stabbings with hypodermic needles further unnerved residents already jittery over deadly rioting between Han Chinese and Muslim Uighurs. (AP Photo/Andy Wong)

Photo by: Andy Wong

Chinese paramilitary police officers patrol near the People's Square after they closed down the road leading to the square in Urumqi province, Xinjiang, China, Friday, Sept. 4, 2009. Thousands marched through this city in western China after a series of stabbings with hypodermic needles further unnerved residents already jittery over deadly rioting between Han Chinese and Muslim Uighurs. (AP Photo/Andy Wong)