On July 17, at around 10:40 a.m., there was a call to the emergency services reporting that an unknown substance was sprayed, injuring people at a junior high school in Kaizuka City, Osaka. According to the fire department, 22 people at Kaizuka Municipal Daisan Junior High School, including students, have complained of symptoms such as sore throats and skin irritation. However, all of them remain conscious.  According to investigative sources, the person believed to have sprayed the substance fled the scene, and investigation is under way.