An unextinguished cigarette killed 168 people in Hong Kong a year after a massive fire in residential skyscrapers, the probable cause of the tragedy has emerged. According to local media, the fire broke out due to an unextinguished cigarette. The fire engulfed several 31-story buildings, which were under renovation at the time. The main culprits for the tragedy are the general contractor and the repair company. They are accused of neglecting fire safety requirements. 168 people were killed in the fire, and the property damage, according to reports in the local media, exceeded 642 million dollars. Photo: Social networks.