A 14-year-old boy was arrested on an attempted murder charge on Tuesday after allegedly dropping a 5-year-old girl from the second floor of a sports facility in Hiroshima Prefecture.

The girl suffered a broken jaw that will require three weeks of treatment in the Monday evening incident at Mihara Region Plaza in Mihara.

"I got angry because the girl clung to me. I never thought of killing her, but ended up doing it on impulse," the third-year local junior high school student was quoted by the police as telling investigators.

According to police and city officials, the boy does not like being touched by anyone and could have panic attacks several times a year. They say he had not previously caused any harm to anyone.

In security camera footage, the girl is seen as possibly playing tag and hiding behind the boy, and grabbing his leg, facility officials said.

The boy -- whose name has been withheld because he is a minor -- is alleged to have tried to kill the girl by carrying her upstairs and dropping her to the entrance hall.

The incident took place as the boy was about to leave for home after visiting a swimming school at the facility with his mother. The girl had come with her father, who was in the gym at the time of the accident, according to the facility officials.

The boy and girl were not acquainted.

The boy told police officers arriving at the scene that he had done something terrible and was sorry for it, according to an observer.