Last year, a fire destroyed a building facing Dotonbori in Minami, Osaka, killing two firefighters.In an interview with the police, we learned that an employee of a store in the building that was referred to the prosecutor's office appears to have thrown away a lit cigarette about 15 minutes before the fire broke out. The employee appears to have been littering cigarettes in the area for some time, and police believe the fire may have started while he was doing this repeatedly, and they are investigating the matter in detail.