Mike Cossey, of Bureau Veritas, uses an air monitor to check the quality of air at a police roadblock marking the 1.5-mile perimeter of the evacuation area around the Arkema Inc. chemical plant Thursday, Aug. 31, 2017, in Crosby, Texas. The Houston-area chemical plant that lost power after Harvey engulfed the area in extensive floods was rocked by multiple explosions early Thursday, the plant's operator said. The Arkema Inc. plant had been left without refrigeration for chemicals that become volatile as the temperature rises. (AP Photo/Gregory Bull)
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