Photos Photos In Photos: Dozens injured after huge explosion in Sapporo Image 4 of 8 December 17, 2018 Police investigators and firefighters investigate the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) The site where an explosion occurred the previous night is seen in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) The site where an explosion occurred the previous night is seen in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) Police investigate the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) Police investigators and firefighters investigate the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) Firefighters investigate the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) Firefighters investigate the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) The site where an explosion occurred the previous night is seen in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka) Police officers investigate damage surrounding the site where an explosion occurred the previous night in Sapporo's Toyohira Ward on Dec. 17, 2018. (Mainichi/Taichi Kaizuka)