An explosion in a visbreaker unit at a Pemex refinery in central Mexico killed two workers on Saturday but did not affect production, a spokesman for the state-run company told Reuters. The fire at the oil refinery in Tula, one of Mexico's biggest refining facilities, was under control, he said. The explosion happened during a experimental trial of the visbreaker, a unit that reduces the viscosity of petroleum and reduces the quantity of residual oil produced in the refining process.
