At least two people have died in fresh protests in a Tibetan part of western China, reports said yesterday, as authorities made arrests in Tibet's capital Lhasa in an effort to reassert control over the restive region.

State media said one police officer was killed and the exiled Tibetan Centre for Human Rights and Democracy reported one Tibetan protester shot dead and another critically hurt after unrest in Sichuan's Ganzi (Garze) Tibetan Prefecture.

"The police were forced to fire warning shots, and dispersed the lawless mobsters," the brief Xinhua news agency report said, without mentioning any deaths of protesters, who, it said, attacked with rocks and knives.

The latest news of unrest and arrests comes after protesters seeking to put pressure on China tried to disrupt the Beijing Olympic Games torch-lighting ceremony in Greece, an act that Chinese Foreign Ministry spokesman Qin Gang called "disgraceful".

French President Nicolas Sarkozy urged China yesterday to show responsibility over the unrest and refused to rule out a possible boycott of the Beijing Olympic Games.

"I don't close the door to any option, but I think it's more prudent to reserve my responses to concrete developments in the situation," Mr Sarkozy said, when asked about a possible boycott.

In Washington, White House spokesman Dana Perino, reacting to Mr Sarkozy's remarks on the Olympics, said there was no change in Mr Bush's plans to attend the Games.

"We believe that China should respect minority cultures - particularly in this case, the Tibetan culture - and we want to make sure that there is freedom of the press and international access to the area," Ms Perino said.

Beijing had hoped the torch's journey around the world and through China would be a symbol of confident national unity ahead of the Games, which open on August 8. Instead, it is caught in a war of words with the Dalai Lama, Tibetan Buddhism's spiritual leader, and his supporters.

Beijing has accused the Nobel Peace Prize-winning monk of masterminding monk-led marches in Lhasa and then an anti-Chinese riot there in mid-March, which authorities say killed 19.

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