A Japanese teenager girl has been arrested for allegedly killing and dismembering a fellow high school pupil.
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A Japanese teenage girl has reportedly been arrested for murdering and dismembering a fellow high school student.

The suspect, 15, who has not been named due to her age, has admitted to attacking Aiwa Matsuo, also 15, with a blunt metal object before strangling her and severing her head and left hand on Saturday, the Kyodo News reported. There were cuts on other parts of the victim's body as well.

The teen was arrested on Sunday on suspicion of murdering Matsuo, the first year student of a high school in Sasebo, Nagasaki Prefecture in southwestern Japan.

Reports claim that the victim's body was found on a bed in the suspect's apartment early on Sunday and the officers found the tools used to dismember her nearby.

The suspect reportedly admitted the crime and stated that she acted alone, while carrying out the murder. The girl, who lived away from her parents though in the same city, has a history of behavioural problems, the news agency said.

"I did it all by myself," she told the police, according to The Japan Times.

Apart from the reported behavioural problem the suspect was suffering from, the reason for her to engage in such a horrifying act has not been identified yet. Meanwhile, a judicial autopsy found that the victim was strangled to death and decapitated later.

Matsuo had gone out saying she wanted to meet a friend but never returned home, forcing her parents to notify the police at night.

The same city was host to a similar crime 10 years ago, when an 11-year-old girl led a fellow elementary student to an empty classroom, and slit her neck and left her to bleed to death.

The suspect had told local media that she did it because the victim had made derogatory comments about her appearance on internet chat rooms.

Also in 2008, a man went on a stabbing spree in a crowded Tokyo shopping street, killing seven people and injuring a dozen others.

The nation had a shock seven years ago as well, when a knife-wielding caretaker killed eight primary school children. Also in 1997, a 14-year-old allegedly murdered two fellow students.