Six other Tibetans were also given long prison terms, it said.
"The sentences are unprecedented in their severity for Tibetans accused of passing on information to people outside Tibet," the group said.
"This new development indicates a harder line approach to blocking news on the current crackdown in Tibet and also appears to represent a challenge to NGOs working on the plateau."
Chinese troops marched into Tibet in 1950 and the region's spiritual leader, the Dalai Lama, fled into exile in 1959 after a failed uprising against Beijing's rule.
Mountainous and remote Tibet was rocked by anti-Chinese protests earlier this year, and
rights groups say hundreds remain in jail following the protests where they are subjected to harsh treatment and even torture.











