Flooding explosions which was downgraded to a tropical depression late on Wednesday, killed at least 31 people and drove tens of thousands from their homes since it first slammed onshore as a Category Four hurricane on Friday night.
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The death toll was rising as bodies were found in receding waters.
Early on Thursday, the Arkema plant in Crosby, which lost power after Harvey engulfed the area in extensive floods, was rocked by two explosions due to lack of refrigeration, according to its operator.
Fire authorities said that the blasts were small and that some deputies suffered irritated eyes from the smoke, but they emphasised that the materials that caught fire shortly after midnight were not toxic.
In the largely rural area surrounding the plant, officials said they had gone door-to-door to explain the situation and call on residents to evacuate, but leaving was not mandatory.

 Fort Bend County in Texas ordered a mandatory evacuation on Thursday for areas near the Barker Reservoir, which was threatening to flood. The reservoir is about 32km west of Houston.
The county did not say how many people the evacuation order would affect.
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Beaumont and Port Arthur cities of Texas worked to evacuate residents after Harvey completed a U-turn in the Gulf of Mexico and rolled ashore early on Wednesday for the second time in six days.
It hit southwestern Louisiana as a tropical storm with heavy rain and winds of 72kph.
In Houston, where Mayor Sylvester Turner issued a night-time curfew to aid search efforts and thwart potential looting, the two major airports had reopened on a limited basis, signaling a slow return to normality.
Houston's two major airports were up and running again on Wednesday.