Two monks also committed suicide late last month because of government oppression, another Tibetan activist group said Saturday.

The reports indicate that unrest is continuing in China's Tibetan areas despite a massive security presence in place since anti-government demonstrations in Tibet's capital, Lhasa, and neighboring provinces broke out in mid-March.

The protests are the longest and most sustained challenge to China's 57-year rule in the Himalayan region. China's subsequent crackdown has drawn international scrutiny and criticism in the run-up to this summer's Olympic Games.

Police fired on Buddhist monks and ordinary citizens who had marched on local government offices in Garze Tibetan Autonomous Prefecture in Sichuan province near Tibet on Thursday, according to the London-based Free Tibet Campaign and the International Campaign for Tibet.

The protesters were demanding the release of two monks who were detained after 3,000 paramilitary troops searched their monastery and found photographs of the Dalai Lama, Tibet's exiled Buddhist leader, the groups said.

The U.S. government-funded Radio Free Asia said it had unconfirmed reports that up to 15 people were killed and dozens injured in the violence.

Calls to local police and hospitals in the area were not answered Saturday or else officials said they had no information.

The official Xinhua News Agency had no details on deaths or injuries but confirmed that a riot broke out near government offices in Donggu town in Garze.

An official was "attacked and seriously wounded," and police were "forced to fire warning shots and put down the violence," Xinhua said.

On Saturday, the Tibetan Center for Human Rights and Democracy, based in India, said two monks committed suicide last month in Sichuan's Aba County following government oppression. Aba County has been the scene of large protests involving hundreds of monks and citizens.

One monk, identified as Lobsang Jinpa, from the Aba Kirti Monastery killed himself March 27, leaving a signed note saying, "I do not want to live under Chinese oppression even for a minute," the human rights group said.

The group said the second suicide occurred March 30 at the Aba Gomang Monastery, when a 75-year-old monk named Legtsok took his life, telling his followers he "can't beat the oppression anymore."

It was impossible to verify the information since Chinese authorities have banned foreign reporters from traveling to the region.

The Tibet Daily newspaper reported Saturday that the government planned to step up its "patriotic education" campaign, which requires monks to denounce their spiritual leader, the Dalai Lama, and declare their loyalty to Beijing.

"We should strengthen patriotic education so as to guide the masses of monks to continuously display the patriotic tradition and uphold the banner of patriotism," the paper quoted Hao Peng, Tibet's deputy Communist Party Chief, as saying.

Thursday's violence in Sichuan province came when the government attempted to enforce "patriotic education" at the Garze monastery, according to the activist groups.

The chief monk at the monastery had refused entry to a government team on Wednesday and the team returned the next day with the paramilitary troops, leading to the arrests and protests, according to the groups.

Chinese authorities say 22 people died in anti-Beijing riots that broke out March 14. The Tibetan government-in-exile says up to 140 were killed in the protests and the ensuing crackdown.

Beijing has accused Dalai Lama supporters of orchestrating the violence, a charge the spiritual leader has repeatedly denied.

In India, police arrested 17 Tibetan exiles Saturday as they attempted to march from the remote Himalayan region of Ladakh in northern India into Tibet, according to local official M.K. Bhandari. Ladakh is home to about 7,000 Tibetan exiles.

The exiles have been arrested for violating the law that prohibits entry into sensitive border areas.

Also Saturday, France's human rights minister denied a report that quoted her as saying President Nicolas Sarkozy could boycott the Olympic opening ceremony unless China releases political prisoners and opens a dialogue with the Dalai Lama.

In a statement, Rama Yade said Le Monde newspaper had misquoted her in Saturday editions when it said she listed necessary "conditions" for Sarkozy's attendance at the Aug. 8 ceremony.

"The word 'conditions' was never used," Yade said in a terse statement.

Sarkozy spokesman Frank Louvrier declined to comment on Yade's interview. Sarkozy has previously said he could "not close the door to any possibility" when asked whether he supported a boycott of the ceremony.