The 11-year-old girl who has admitted killing her classmate at a primary school here told police that the classmate posted a message on an Internet bulletin board taunting her for being a goody-goody, investigative sources said Friday.
The girl, whose name cannot be revealed because she is a minor, had earlier told her lawyers that she killed Satomi Mitarai, 12, because Mitarai had posted bulletin board messages criticizing her appearance and weight.
The message in which Mitarai said the girl was acting like a goody-two-shoes was posted May 28, four days before the incident.
That message and a couple of others riled the girl and prompted her to decide that day to kill her classmate at Okubo Elementary School, according to the sources.
The girl killed Mitarai by slashing her neck with a paper cutter that she carried inside her pencil case.