But Pemex acknowledged in a report that starting in late 2011, a series of smaller blasts and fires, mainly at refineries and petrochemical plants, had ‘‘seriously impacted’’ its safety rate. It said the rate of injuries per million hours had risen to 0.54.
As part of the federal government, Pemex is entirely responsible for inspecting its own buildings. Murillo said investigators were looking into the records of building inspections, and why they had not discovered the accumulation of gas.
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