A 16-year old boy pleaded guilty in court Wednesday to murdering his parents and blowing up their apartment in June with an explosive device.
Prosecutors told the Tokyo District Court that the boy, who cannot be named because he is a minor, repeatedly struck his 44-year-old father in the head with a dumbbell and stabbed him in the neck with a knife. They said his 42-year-old mother was stabbed more than 40 times.
After the two murders, prosecutors alleged the teen, who was 15 at the time, triggered an explosion in the family's apartment by cutting the gas line in the kitchen and rigging the electric stove with a timer.