A 33-year-old man in possession of knives was arrested Wednesday after stabbing four officials at Kanazawa City Hall in Ishikawa Prefecture, police said.
Junichi Takahata was apprehended on the seventh floor of the building after stabbing male and female employees in their 50s and 60s on the third and fifth floors shortly after 3 p.m.
"There's nothing I can say for now," Takahata was quoted as saying by police. But investigators said Thursday that he has visited city hall several times recently to discuss issues regarding the public housing facility in which he lives.
The four officials sustained serious injuries but none of their conditions are life-threatening, according to the police.
Since there is a service window for citizens on the third floor of the building, people were able to go in and out freely.
No other people inside the building were injured when the attack took place, police said.