Overview
- Police say the sauna’s L‑shaped wooden handle had detached and the latch bolt failed to retract, leaving the door stuck when the couple was found near the entrance.
- The in‑room emergency button’s plastic cover was broken from repeated pressing, yet the first‑floor receiver panel had no power, and the owner told investigators he had never switched it on since taking over two years ago.
- A burnt towel was recovered inside, and investigators are examining whether it was used to try to break glass or to trigger an external smoke detector by intentionally creating smoke.
- The First Investigation Unit is reviewing the operator’s equipment checks and emergency procedures and is considering a professional negligence resulting in death charge.
- Regulatory gaps are under scrutiny as Minato’s health inspections did not cover door hardware or emergency buttons, and Fukuoka City ordered safety checks of 136 sauna facilities with on‑site confirmations starting this week.