From BBC News:
Chinese police have rescued more than 100 village children sold to work as slave labourers in the booming southern province of Guangdong. The children, from the ethnic Yi minority, came from poor families in Sichuan about 600 miles ( 960 km) away. The China Daily said 167 children had been rescued from the factory in the industrial city of Dongguan so far, and several arrests had been made.
China announced a nationwide crackdown on slavery and child labour last year.
See also a CDT translation of a Southern Metropolis Daily investigation into this case.