Calls are mounting for improvement in the foster care system following a November incident here in which a 3-year-old girl was allegedly beaten to death by her foster mother.

Ri Yong Shim, 43, was arrested on suspicion of punching Junko Omura in the face and body at her home because the girl would not stop crying.

Her husband called an ambulance and the girl was taken to a hospital, where she was pronounced dead soon afterward, police said.

Police sources said the South Korean foster mother, considered a child-raising expert, attacked the girl because she was unable to consult with others about problems involving child rearing.