The man arrested on suspicion of abandoning the body of a 13-year-old girl from Osaka Prefecture may have used the victim's Line smartphone app to send messages to her friend after kidnapping her, investigative sources said Tuesday.

The sources also said a small amount of blood was found in a car owned by the 45-year-old suspect, Koji Yamada, who was arrested Friday on suspicion of abandoning the body of Natsumi Hirata from Neyagawa, Osaka Prefecture.

Police are conducting a DNA test in the hopes of determining whose blood it was, suspecting that Yamada might have used the car to transport Hirata's body.