Deer Park residents expressed their frustration over the lack of timely notifications about the incident.

Attorney Ryan Zehl of the Zehl & Associates Law Firm says he represents four contractors who were at the site when the deadly release happened last Thursday. The hydrogen sulfide release led to the deaths of two people and 13 others had to be hospitalized.

The Deer Park refinery leaked hydrogen sulfide into the air on October 10, causing 2 deaths and close to three dozen injuries.

Following a release of chemicals at the PEMEX facility in Deer Park, several surrounding residents sought medical treatment, according to Houston attorney Ryan Zehl.

The highly-flammable and toxic gas killed two people and 35 others had to be treated at the Pemex facility in Deer Park.