According to the fire department, shortly after 11 a.m. on the 29th, a report was received from a teacher at Shirasagi Municipal Elementary and Junior High School in Himeji City, Hyogo Prefecture, stating that "black smoke came out during an experiment in a second-year junior high school science class, and students who inhaled it are complaining of feeling unwell." According to police, approximately 20 people complained of feeling unwell, and multiple people were transported to hospitals.