Two Tibetan environmentalists, Tseten Dhondup, 35, and Zumgah, in his 50s, were arrested by Chinese authorities in September and December 2013 for their involvement in various environmental campaigns in Yushul County. They were arrested by two head police officers who the local Tibetans allege are corrupt. Sources say that Zumgah had prevented illegal activities by miners who had collaborated with these two police officials.