Alabama Gov. Robert Bentley declared a state of emergency Tuesday following a pipeline explosion Monday in Shelby County that led to a major interstate gas line being shut down for the next week.

"The State of Emergency will facilitate the granting of a waiver from the U.S. Department of Transportation - Federal Motor Carrier Safety Administration," Bentley said in a Tuesday press release. "This waiver is needed to lift the federal government's limitation on the hours a driver can transport gasoline."

Tuesday marked the second time in as many months that Bentley, a Republican, declared a state of emergency because of breaks on a gas line owned and operated by Colonial Pipeline.

Gas transmission on the pipeline, which runs from Texas to New Jersey and New York, was down for over a week last month following a break in a Shelby County stretch of the line located about five miles from the site of Monday's explosion.

One worker died in the explosion and four were hospitalized with injuries, Colonial confirmed Tuesday. The company does not yet know what caused the explosion, though it said Tuesday that it expects its pipeline to be down for at least a week.

"My thoughts and prayers are with the six injured workers and with the family of the fatally injured worker," Bentley said in the press release. "An accident of this magnitude is tough for any community to deal with, and I want to personally thank the local first responders for their immediate assistance to this accident, as well as the first responders from surrounding counties. They all provided resources and support to the help Shelby County in their time of need."

Bentley's office had yet to return a Tuesday morning call seeking comment as of 2:15 p.m. Tuesday.