Anti-apartheid leader Desmond Tutu had invited the Tibetan spiritual leader, a fellow Nobel Peace Prize winner, to give an inaugural peace lecture as part of celebrations for Tutu's 80th birthday.

"His Holiness was to depart for South Africa on October 6, 2011 but visas have not been granted yet," said a statement from the Dalai Lama's office in India, explaining the cancellation of the trip.

"We are, therefore, now convinced that for whatever reason or reasons, the South African government finds it inconvenient to issue visa to His Holiness the Dalai Lama," the statement said.

Pretoria denied the Dalai Lama a visa in 2009, with South Africa admitting that it feared angering China, which regards him as a "splittist" despite his calls for autonomy rather than independence for Tibet.

The cancellation comes after Tutu accused the South African government of foot-dragging over the visa application for the week-long trip.

"The only response to the letters received to date have been acknowledgements of receipt," said a statement by Tutu's office.

South African President Jacob Zuma said on Monday that he did not know if the Dalai Lama would be granted a visa, saying the matter was in the hands of the country's international relations department.

Tutu's birthday will include a book launch on October 6 and a public church service followed by a picnic party on his actual birthday the next day.

The following day the Dalai Lama was due to deliver Bishop Tutu's 80th Birth Anniversary Inaugural Lecture.

The Buddhist monk "travels around the world to promote human values, religious harmony, world peace, and compassion," the Dalai Lama's office in India said.

"In doing so, His Holiness does not want to create any inconveniences to anyone, individuals or governments," it said.

"His Holiness has thus decided to call off his upcoming visit to South Africa and, he regrets the inconveniences caused to his hosts and the large number of South African public."

The Dalai Lama has lived in exile in India since 1959 when he fled an abortive uprising against Chinese rule in Tibet.

The 17-year-old from Sichuan province's Kirti monastery, the scene of repeated protests, shouted slogans against the Chinese government as he tried to self-immolate, the US-based International Campaign for Tibet (ICT) said.

Citing Tibetans in exile with contacts in Aba town, where the incident occurred Monday, the activist group said the monk was immediately surrounded by security personnel who extinguished the flames, beat him and took him away.

The incident -- confirmed by another Tibet rights group with contacts in the region -- comes just one week after two other young monks set themselves on fire at Kirti in an apparent protest against perceived religious repression.

The restive Tibetan Buddhist monastery has been the scene of repeated protests, according to rights groups, and previous self-immolations in the region have triggered a crackdown.

ICT said Kelsang Wangchuk, the monk who set himself on fire Monday, carried a photo of the Dalai Lama when he mounted his protest, adding his current condition and whereabouts were unknown.

The Dalai Lama, Tibet's spiritual leader who fled to India in 1959 after a failed uprising against Chinese rule, is revered by many Tibetans but criticised by Beijing as a "splittist".

An employee at the Aba local government told AFP she was "unaware" of the incident, and the local police and hospital were not immediately available for comment.

One local reached by phone, who refused to be named, said he did not know about the latest self-immolation, but added there were a lot of police in Aba town on Monday.

"I went out at around 3pm (0700GMT) but the road was blocked by police. I waited there in the rain for over an hour, and then the police told us to go home," he said.

"We were told to stay inside after that," he added.

A man inside Kirti monastery told AFP there were police outside the building, but refused to comment further.

Barry Sautman, an associate professor at the Hong Kong University of Science and Technology who studies ethnic politics, said self-immolations in Tibetan regions had been a "rare" occurrence until recently.

"I don't think that we knew of any examples until recently, at least no examples that occurred inside Tibet," he said, referring to wider Tibetan areas.

"There was one example of a Tibetan exile who immolated himself some years back. At the time, the Dalai Lama condemned the self-immolation and said it contravened the Buddhist idea of the sanctity of life.

"So it's rather unusual for Buddhist monks in Tibet who are presumably devoted to the Dalai Lama to take this path."

Many Tibetans in China are angry about what they view as increasing domination by the country's majority Han ethnic group.

China, however, says that Tibetan living standards have improved with billions in Chinese investment.

Apart from the three attempted self-immolations over the past week, there have been two other reported cases in the same restive Tibetan region in Sichuan -- one in August and another in March.

Stephanie Brigden, director of Free Tibet -- another rights group -- said it was an "extremely worrying and absolutely unprecedented trend."

"A growing number of Tibetans clearly feel that this is the only way that they can be heard," she said.