NEW : `` And once they -- the parents -- realized it was their child , obviously they collapsed in grief . '' Death toll could reach 50,000 , according to state-run media . China 's one-child policy , implemented in 1979 , has blocked 400 million births . Comment: Schools collapsed on thousands of children Monday when the quake hit .
NEW : Death toll could reach 50,000 , according to state-run media . China 's one-child policy , implemented in 1979 , has blocked 400 million births . Comment: Schools collapsed on thousands of children Monday when the quake hit .