The closing is one of several restrictive policies in the area, sources say.
They are accused of exchanging politically sensitive information and calling for independence from Beijing.
He returns to his hometown after serving six years for his role in protests in Ngaba.
They demand fair compensation and 'equal rights.'
Relatives were never told they had been charged or tried.
Supporters say they are concerned about the young man's health.
But her current condition is still unknown, sources said.
Bapa Phuntsok Wangyal passes away in Bejing at 92 and the Dalai Lama expresses his condolences.
It is the 130th burning protest against Chinese rule.
Authorities have refused requests to move him to a hospital for better care.
Two are held in connection with the painting of independence slogans and mailing of 'anti-China' writings to local officials.
Their protests occurred on the same day in neighboring Chinese provinces.
The protests in Gansu province's Sangchu county are the latest against Chinese state-backed mining in the area.
He had taken part in protests challenging Chinese rule in Tibetan areas.
The independence slogans were written in red paint on boulders in Tibet.
The burning protests occur on the sixth anniversary of the deadly Chinese crackdown on Tibetans in Ngaba.
Security forces march in Lhasa, question Tibetans in Chinese provinces.
