One worker was killed and another was injured in a Monday morning blast at a chemical factory in Yokohama, police and firefighters said. Bare Frames are all that is left of a chemical factory building in Kanazawa Ward, Yokohama, after an explosion Monday morning. KYODO PHOTO The blast occurred at around 8:50 a.m. at one of the eight buildings at the factory of chemical maker Kanto Koatsu Kagaku Co. in Kanazawa Ward. The building that suffered the blast is used for conducting experiments.