A paramilitary police officer stands guard in front of a row of transport trucks in Zhongdian, in a Tibetan area known as Shangri-La, in China's southwest Yunnan province Friday March 21, 2008. Thousands of troops converged on foot, in trucks and helicopters in Tibetan areas of western China on Friday as the government stepped up its manhunt for protesters in last weeks anti-government riots in Tibet's capital. (AP Photo/Greg Baker)

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