Note : Police say 5 died ; fire officials had said previously that 4 were critically injured . The incident happened during a maintenance and cleaning operation , police say . Yokkaichi is located about 320 Kilometers ( 200 miles ) west-southwest of Tokyo . The plant is located in Osaka , Japan .
Note : Police say 5 died ; fire officials had said previously that 4 were critically injured . The incident happened during a maintenance and cleaning operation , police say . The plant is located in Osaka , Japan .