Here's a documentary about the shooting of unarmed Tibetian refugees by the Chinese border police in 2006. The refugees were escaping Tibet to come to Dharamsala to meet their leader, the Dalai Lama. This documentary incorporates video footage taken of the shooting as well as interviews with eyewitnesses and the refugees themselves.
One 17 year old nun was shot and killed in the shooting along with 6 other unconfirmed victims. China considers this event part of its "normal border management".
This video will hopefully also serve to refute the propaganda of Chinese origin posters here about the rosy life that Tibetians are leading in China.
Tibet: Murder in the Snow | Watch Free Documentary Online