ExxonMobil has settled a negligence lawsuit tied to a deadly 2013 Texas refinery blast.

Attorneys with Beaumont-based Provost Umphrey Law Firm said that a court order signed on May 10 resolves claims filed by the parents of the deceased and injured workers.

The terms of the settlement were not disclosed.

The suit was filed by the parents of two workers who were killed and six others who were injured in the April 17, 2013 blast.

According to Reuters, the fire began at a shut hydrotreater heat exchanger that was undergoing planned maintenance.

The injured workers and families of those who died argued that “ExxonMobil did not take reasonable steps to warn the workers of the presence of hydrocarbons, inspect the equipment or adequately maintain the premises given the dangerous conditions that were present at the plant,” Provost Umphrey said.

Exxon has not commented on the settlement.

“This was a horrific tragedy that has devastated all of the families involved. While the terms of the settlement are confidential, the families are pleased to have the litigation resolved although injuries sustained will continue for a lifetime,” Provost Umphrey attorney Matthew Matheny said.

Last August, the California Division of Occupational Safety and Health ordered Exxon Mobil to pay $566,600 in fines for violations tied to a February refinery blast in Torrance, California that injured four workers.