A reported explosion appears to have been the cause of fire early this morning at the Sekisui Plastics plant, 13950 U.S. 68, on the south edge of Kenton. There was no one seriously injured in the fire or explosion. Hardin County Sheriff Keith Everhart said his arson team has been called to investigate the fire. There is nothing suspicious about the explosion, said Everhart, but the team has been asked to determine its cause.