The Tokyo Family Court decided Thursday to institutionalize a 13-year-old girl for pushing a boy from an apartment building in Tokyo in June, saying she has trouble thinking rationally.

The judgment also allows an institution to keep her under lock and key for up to 180 days over two years for rehabilitation. The decision took effect Thursday, though the institution to which she will be sent was not immediately known.

While the girl has denied pushing the boy, the court rejected her claim, concluding, “It is evident she made him fall.”

She would have understood fully that the boy could have died from the fall, according to the ruling.

“It is highly likely she will repeat behavior that could cause critical damage unless appropriate and strong measures are taken. Her parents are not able to resolve the problem,” presiding Judge Kazunobu Yamazaki said. “She needs instruction by experts.”

The ruling said the girl, whose father is Japanese and mother Malaysian, can communicate in five languages but is unable to speak any one language adequately and is “unable to think rationally.”

She has developed strong feelings of persecution, believing people give her the cold shoulder in Malaysia as a Japanese and in Japan as a Malaysian, it said.

The ruling also stated that she was abused in early childhood by a baby sitter.

Her sense of self has remained childlike and she tends to lose her temper easily and attack people, it said.

The girl began her education in Japan after her family moved here and enrolled her in the fifth grade at a public school in Tokyo’s Shinjuku Ward, according to the ward’s board of education.

She did not speak Japanese well and was enrolled in special classes for children who refuse to go to school. On June 22, the girl pushed the 5-year-old Chinese national, after letting him sit on the outdoor stairwell railing between the fourth and fifth floors of the apartment building. The boy landed in bushes and survived with minor injuries.

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