A court in China has jailed prominent Tibetan environmentalist Karma Samdrup for 15 years on charges of robbing tombs and dealing in looted relics. Samdrup's lawyer said police had used false evidence. His wife said he had been beaten in custody. There has been no comment from the authorities on the sentence. International human rights groups say China has increased pressure on leading Tibetan figures since riots killed 22 people in the region in 2008. Samdrup, 42, was sentenced by a court in China's western region of Xinjiang. The BBC Damian Grammaticas, in Beijing, says he is the most high-profile Tibetan figure to be jailed in recent years.