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.

The Pemex refinery chemical leak killed 2, injured dozens and forced shelter-in-place orders in Deer Park and Pasadena. They have since been lifted.

County commissioner Adrian Garcia accused Pemex of failing to use the CAER system or otherwise notify community members about the incident.