In Texas, federal investigators have launched a probe after a toxic chemical leak killed four workers at a DuPoint plant. The workers were killed by a leak of methyl mercaptan, which is used to make insecticides. Plant manager Randall Clements said the cause is unknown.

Randall Clements: “It’s with deep regret that I’m here today to inform you that today we lost four of our family members from the La Porte site. We had the incident this morning that resulted in the exposure of five employees, four of which were fatally exposed. The fifth is in the hospital, expected to make a full recovery. He’s merely [there] for observations. We will continue to cooperate with all the local authorities and make sure that we investigate this fully, and we will find the cause.”