China has repeatedly ignored calls for dialogue, accusing the exiled Tibetan leader and his supporters of organizing violence in hopes of sabotaging the upcoming Beijing Olympics and promoting Tibetan independence.
Hundreds of paramilitary troops aboard at least 80 trucks were seen traveling along the main road winding through the mountains into southeastern Tibet. Others set up camp and patrolled streets in riot gear, helmets and rifles in the town of Tiger Leaping Gorge, a tourist attraction in Yunnan province bordering Tibet.
Farther north, the largely Tibetan town of Zhongdian, renamed Shangri-la a decade ago, was swarmed by 400 armed police. Many carried rifles and what appeared to be tear gas launchers. Residents walked freely among the military, and there was no sign of a daytime curfew.
The troop mobilization was helping authorities reassert control after the broadest, most sustained protests by Tibetans against Chinese rule in decades. Demonstrations had flared across Tibetan areas of Sichuan, Gansu and Qinghai provinces in support of protests that started in the Tibetan capital of Lhasa.
Led by Buddhist monks, protests had begun peacefully in Lhasa early last week but erupted into rioting on March 14, drawing a harsh response from Chinese authorities.
The crackdown drew worldwide attention to China's human rights record, threatening to overshadow Beijing's attempts to project an image of unity and prosperity in the lead-up to the Aug. 8-24 Olympics.
Yesterday, a group of 26 Nobel laureates said they "deplore and condemn the Chinese government's violent crackdown on Tibetan protesters," calling for Beijing to exercise restraint.
"We protest the unwarranted campaign waged by the Chinese government against our fellow Nobel Laureate, his holiness the Dalai Lama," the group said in a statement released by the Elie Wiesel Foundation.
Tibetan exile groups have said 80 people were killed in the protest and its aftermath, while Beijing maintains that 16 died and more than 300 were injured.