A Mexican state-owned energy company is being sued by three of its workers after they were injured following a gas leak.

Three workers filed a lawsuit in a Texas state court in Houston on Monday against Mexico's national oil company Pemex for injuries they allege they received in a hydrogen sulfide release at a Deer Park,

At least two workers at a Houston-area oil refinery were killed when hydrogen sulfide leaked at the plant, setting off urgent warnings for nearby residents to stay indoors before authorities determined the public wasn't in danger.