A young Tibetan writer and teacher has smuggled out a letter from prison saying he is serving a ten-year sentence linked to his unpublished book. Twenty-nine year old Dolma Kyab, who is known among his friends for his passionate concern for Tibet's environment, was detained in March 2005 and is being held in Chushur (Chinese: Qushui) prison south-west of Lhasa on charges that appear to be of 'endangering state security'. In his letter from prison, Dolma Kyab appeals for help from United Nations committees on human rights, and says that he was imprisoned because of the ideas expressed on Tibet in his unpublished manuscript. A group of well-known Tibetan and Chinese writers have written a letter calling for his release.