Freed three years ago after serving a 21-year term, he is seized by police at midnight in Tibet's capital Lhasa.
They are told not to block construction of a road planned to support mining operations in the area.
They are taken away by police with no word given on their present whereabouts or charges made against them.
Dangerous roads and exposed power lines lead to injuries and deaths, a local source says.
He has six years left to serve of a 13-year sentence for calling for the Dalai Lama's return to Tibet.
Police also found a call for Tibetan freedom written on the wall of his room, sources with contacts in the region say.
He is taken into custody while walking in prayer near his monastery, an exile source with local contacts says.
The practice of saving lives improves future rebirths for those taking part, Buddhists believe.
Chinese authorities change course after first telling Tibetan protesters they had no right to block the work.
Poetry writer and social commentator Jo Lobsang Jamyang is jailed for seven and a half years on unspecified charges.
More than 100 villagers have blocked traffic on a roadway, fearing more environmental damage from the mining activities.
A young monk is released after serving a two-year term, and a popular singer is freed after briefly being held for singing a banned song.
She calls out for Tibetan freedom and the Dalai Lama's return after setting herself ablaze outside a monastery.
He is taken away after displaying a photo of exiled spiritual leader the Dalai Lama and calling for Tibetan freedom.
They are taken into custody after trying to mediate in an argument between a Tibetan and a Chinese driver.