Police investigating a possible serial poisoner at a Yokohama hospital believe the killer injected a toxin into multiple intravenous drip bags after they were brought out of storage.
A chemical used in disinfectant that likely killed two elderly male patients at Oguchi Hospital may have been injected through rubber plugs in the bags in a nurses' room during a lightly staffed three-day holiday, investigative sources said Wednesday.
The poison matches the surfactant in a disinfectant kept on the ward.