University professor, blogger, and member of the Muslim Uighur minority, Ilham Tohti pauses before a classroom lecture in Beijing on June 12, 2010. Perhaps the top Uighur activist within China, Tohti disappeared into police custody for six weeks last year after Uighur resentment burst forth last July in China's northwest Xinjiang province, in Central Asia, when Uighur rioters savagely attacked Han Chinese in the regional capital Urumqi, leaving nearly 200 people dead and up to 1,700 injured, according to official figures. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)