Wednesday's detention is the latest indication of the government's increasing hardline stance on dissent surrounding Xinjiang, where a series of violent riots in the past year have killed at least 91 people, rights activists say. Xinjiang is home to the Muslim Uighur people who speak a Turkic language. Many resent what they see as oppressive treatment by the government, though Beijing says they are granted wide religious, cultural and linguistic freedoms. Police in Beijing seized Ilham Tohti, a prominent Uighur economist who has championed the rights of the Uighur community in Xinjiang, at his home and his whereabouts were unknown, his wife and close friend told Reuters.