The incident took place while the victim was commuting home
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News from Chiba
Child's grandmother called emergency services: 'My daughter is holding a knife and talking about suicide'
Bag containing bag the contraband was found dropped in a parking lot last November
Suspect said, ‘I slashed the skirts of the high school girls for thrills’
Both suspects deny possessing marijuana
Matter emerged after a female staff member found the camera on December 12
One suspect reportedly threatened, ‘We’ll kill you’
Perpetrator fled the scene by car, police said
Suspect told police that he did 'not intend to kill'
Victim had been slashed in the neck, police said