CVR Energy, Inc. confirmed that it launched an immediate internal investigation into the cause of the boiler explosion that occurred at the refinery on Friday evening, fatally injuring one employee and critically injuring another.

The explosion occurred at approximately 6:20 p.m. as operators were restarting a boiler that had been temporarily shut down as part of the refinery's turnaround process.

"I would like to express my deepest sympathy for the employees and families affected by this tragedy," said Jack Lipinski, CVR Energy chief executive officer. "We are conducting a thorough investigation of the incident and cooperating fully with OSHA and the Oklahoma Department of Labor.

"Our focus is to determine how this accident occurred and what steps must be taken to avoid a repeat of this incident.

We remain committed to providing a safe working environment for our employees and contractors," he said.

Tags: CVR Energy, Inc.