Tibetans in China's tense southwestern province of Sichuan said on Friday they believed police had killed several people in anti-Chinese riots there this week, disputing official claims none died.

China's official Xinhua news agency reported overnight that police shot and wounded four protesters this week in a heavily ethnic Tibetan part of the province, where protests broke out after anti-Chinese riots in neighboring Tibet a week ago.

The unrest has alarmed China, keen to look its best in the run-up to the August 8-24 Olympic Games in Beijing when it hopes to show the world it has arrived as a world power.

Chinese mountaineers chosen to take an Olympic torch to the top of Mount Everest said their journey there through Tibet would be a show of national unity against exiled Tibetan leader the Dalai Lama, whom Beijing accuses of instigating the unrest.

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"We shall go all out to ensure the smooth movement of the torch relay. We must strengthen ethnic unity while hostile forces try to drive a wedge between ethnic groups," Yin Xunping, an official with the Tibet mountaineering effort, was quoted as saying by the official Xinhua news agency.

Tensions remain high in Tibet, Sichuan and other neighboring areas where the government has poured in troops.

Kangding, a heavily Tibetan town in Sichuan and a gateway to the restive region, was crowded with troops, some on patrol, some loudly practicing martial arts moves in the town square.

Drivers refused to travel into tense mountain towns.

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