A 7-year-old girl who was found dead on a railroad track in the city of Niigata on Monday had told classmates that a stranger talked to her on her way to school that morning, investigative sources said Wednesday.

Second-grade student Tamaki Omomo is likely to have been killed hours before her body was hit by a train, the sources said, as her body temperature was low and there were few signs of bleeding when she was discovered.

Her body was found after police were alerted by the driver of the train, which struck her at a low speed.