A senior US lawmaker, Nancy Pelosi, has called for an independent investigation into China's claims that the Dalai Lama instigated the violence in Tibet.
Ms Pelosi, Speaker of the US House of Representatives, also called on the international community to denounce Chinese rule in Tibet.
China says 18 people have been killed by rioters in Lhasa, the main city. The Tibetan government-in-exile - headed by the Dalai Lama, regarded by many Tibetans as their spiritual leader - says at least 99 people have died in the crackdown by Chinese troops.
Chinese officials have accused the Dalai Lama and his supporters of organising violent clashes in Tibet in an attempt to sabotage this summer's Beijing Olympics and promote Tibetan independence.
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