Foxconn has one million employees the many factories plus accommodation schools, entertainment fill an area the size of a large city It has been said that more than 200,00 are employed to produce Apple related products alone. According to another news story it was the polishing factory at the Chengdu factory which was open late last year, this is a new multibillion dollar facility and is where the explosion took place. This facility is part of the massive expansion that Foxconn is doing to accommodate Apple's growth. As another user pointed out information is sketchy so just have to wait and see. The figures above do not include family members whom reside with in Foxconn which I read sometime back boosted the size to 4-5 million.