China's crimes against its minority Muslim populations have reached "unprecedented levels" in recent years, a US-based rights group said on Monday. China has "arbitrarily detained" up to one million people in a network of what it calls "political re-education camps," detention centers and prisons that span 300 to 400 facilities in which forced labor and torture are commonplace, Human Rights Watch said in a report detailing the crackdown. "The oppression ...