The Dalai Lama today called for an international investigation to determine whether China is committing "cultural genocide (in Tibet), either deliberately or not," The Hindu newspaper reported the Hindustan Times in its digital publishing.

The exiled spiritual leader of Tibetan Buddhists said at a press conference in the Indian city of Dharamsala that the international community has a "moral responsibility" to remind China to be a good host to the upcoming Olympic Games.

"The Tibetan nation faces a serious danger. Whether the Chinese government admits it or not, there is a problem," he said, while considering that the Olympics "should not be cancelled."

He stressed that the Tibetan people should be free to follow their traditions, and complained that Beijing is relying on force to achieve peace, but peace can only be achieved if comes from the hearts of the people ".

He also said that currently China has put restrictions on monasteries and a "political education", drowning culturally Tibet.

Meanwhile, Chinese authorities today tightened siege in Lhasa, the capital of Tibet, to quell the protests which according to Tibetan exiles have spread to other areas and have left 80 dead, reported Radio Free Asia (RFA), funded by the U.S. government.

According to the sources the Chinese security forces have been deployed in the city streets and requested identification cards, including Tibetans, while Chinese workers can move freely.

At least 200 military vehicles, with between 40 and 60 armed soldiers each, have been sent to the city, noted the diffuser.

"The soldiers are reviewing house and are entering by force to seek demonstrators or potential rebels Tibetans", a witness reported to RFA.

For its part the Tibetan authorities in exile, through its spokesperson, confirmed that the recent clashes between the Chinese authorities and demonstrators Tibetans have left 80 dead, contrary to the figure reported by the Chinese government.

China for its part maintains that the death toll is 10, and blamed the deaths of the demonstrators. The Chinese official news agency Xinhua reported that 12 policemen were seriously injured.

The Dalai Lama said in an interview with the BBC that British chain has "serious concerns" that the violence will continue.

"This is becoming very, very tense. Tibetans are very specific, and the Chinese as well. So, the result is more suffering, more death," said the Tibetan spiritual leader.

He noted that Beijing needs to change its attitude towards the territory, which has ruled since the invasion in 1950.

The demonstrations were toughened two days ago when they started strong anti protests in the capital under the Tibetan anniversary of the exile of the Dalai Lama in 1959.

RFS according to witnesses reported that the demonstrations are no longer only in the Tibetan capital but have spread to the cities of Lithang, in southwestern Tibet, as well as Sershul, Sichuan Province, and in the Samye Monastery, the south of Lhasa.

China on Saturday gave an ultimatum to surrender the demonstrators Tibetans after the riots in Lhasa, considered the worst unrest in Tibet in two decades. The authorities gave the demonstrators until Monday at midnight to surrender and receive the benefit of indulgence.