by Sarah See
The nun, identified as Qiu Xiang, 35, is the second nun and 11th Tibetan to self-immolate since March, according to the news reports.
Xiang set herself on fire at a road crossing in Dawu County, in the Ganzi region of Sichuan Province, according to the official state-run Xinhua News Agency.
Her death was reported by Xinhua and confirmed by exile groups, according to CNN.
It was unclear why the woman killed herself. Tibetan campaign groups say it was in protest against Chinese rule, but China's Ministry of Foreign Affairs claims the incident is related to "pro-Tibetan independence forces" overseas, according to CNN.
The local government was investigating, Xinhua said.
Xiang, whose Tibetan name was Palden Choetso, called for freedom and the Dalai Lama's return from exile when she was burning, according to the International Campaign for Tibet (ICT).
Xiang's body was taken by fellow nuns to the Ganden Choeling nunnery in Tawu, the ICT said.
The nine men and one woman, aged in their late teens and twenties, who set themselves on fire since March, were seen as acting in protest to Chinese restrictions on the Tibetan religion and culture, according to the Associated Press.
At least six died of injuries, while the conditions of the others are unknown, according to the Associated Press.
China rejects accusations of oppressing Tibetans, saying it has greatly improved the people's living standards, according to CNN.