A 7-year-old girl was found dead after being hit by a train in central Japan, authorities said Tuesday, with police investigating the incident as a possible murder due to the victim's body showing signs of having been strangled.

The young girl, identified as Tamaki Omomo, was a second-grade elementary school student in the city of Niigata and had been missing since Monday evening, investigative sources said.

Bruises on her face suggested the possibility that she was strangled sometime before being hit by the train on Monday night in Niigata Prefecture, police said.