Lobsang Jinpa had been charged with writing the lyrics to a song honoring a former Tibetan religious leader.
Local residents are also warned not to discuss politics or share news or photos with outside contacts.
Chinese officials force the move, citing concerns for the environment, a local source says.
But Chinese travelers and trade goods cross without delays, a local source says.
In a practice previously ignored by police, they had brought small quantities back to sell to friends in need.
They had been moved before from traditional grazing areas, and now must move again to make way for tourist development.
Chat group organizers must guard against discussions that threaten China's 'interests,' authorities say.
Tibetan drivers will now be checked for proper documents as China prepares for top-level Party meetings in faraway Beijing.
The event follows other religious gatherings held without interference by authorities in recent years.
'Consequences' are threatened for anyone caught viewing or sharing politically sensitive material ahead of an important Party Congress.
No one may enter Tibet during top-level Party meetings scheduled next month in Beijing.
The move restricts travel by the Tibetan minority group despite official guarantees against discrimination.
Chinese soldiers and civilian officials ask locals' help to extend road farther into Nepal.
Chinese authorities order them to leave without explanation, threatening fines and jail for failing to comply.
Villagers enjoying an outing 'on their own land' are searched and attacked without explanation, sources say.
Kardze prefecture authorities have appointed six ruling Chinese Communist Party members to supervise the study center's affairs.
Atruk Lopo had also called for the release of his uncle, prominent political prisoner Ronggye Adrak.