Overview
- Shizuoka police transferred Masaki Oyama, 38, to the Numazu branch of the district prosecutors office on an attempted murder charge.
- Fifteen male employees aged roughly 20 to 50 were hospitalized, all conscious on transport, with some reported as possibly seriously hurt.
- Investigators say the suspect is a former worker who has cited workplace harassment and dissatisfaction with relationships at the plant.
- Police report the attacker wore a gas‑mask‑like item, used a survival knife, and dispersed a bleach‑like liquid; a home search seized multiple bleach containers.
- Authorities are examining evidence that the assault was timed to the day‑night shift change at the large Mishima tire factory.