Smoke and an explosion were reported on Thursday at the flood-hit Arkema SA chemical plant in Crosby, Texas, Houston TV station Fox 26 reported.
The company evacuated remaining workers at the damaged plant on Tuesday, and Harris County ordered the evacuation of residents within a 1.5-mile (2.4-km) radius of the plant, which makes organic peroxides used in the production of plastic resins, polystyrene, paints and other products.