FILE - This Dec. 10, 2015, file photo, shows a Dow Chemical plant in La Porte, Texas. A final federal report has found that a series of failures, including flawed equipment and inadequate safeguards, helped cause a 2014 poisonous gas leak that killed four workers at the Houston-area chemical plant. The U.S. Chemical Safety Board said Tuesday, June 25, 2019, various safety management system deficiencies contributed to the severity of the incident. (AP Photo/Pat Sullivan, File)
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