BANGKOK (AP) — A massive explosion at a chemical factory on the outskirts of Bangkok has killed at least one person, injured dozens more and damaged scores of homes, while prompting the evacuation of a wide area over fears of poisonous fumes and the possibility of additional denotations. Dense clouds of black smoke were continuing to billow from the site late in the day, as winds shifted and started blowing toward the city’s center. Evacuation centers have been set up in a school and a government office for those forced from their homes. The fire broke out at a foam and plastic pellet manufacturing factory. There was no immediate word on what caused the blaze.