Officials say an explosion at a Houston-area chemical plant has left one worker dead and three hurt. Pasadena police say the tank accident happened Saturday afternoon at the PeroxyChem Bayport Plant. A statement from Philadelphia-based PeroxyChem says the workers were doing a routine function when the contractor’s equipment exploded. A contractor died at the scene. Two PeroxyChem employees and another contractor were taken to a hospital. Police say one worker has a broken arm, while the other two were being treated for exposure.