Gas line explodes in West Virginia

A major gas line has exploded in Sissonville, West Virginia, officials told CNN.

Several structures in the area are on fire, Kanawha County Commission President Kent Carper said.

He said it sounded "like a jet engine" as the fire raged. No injuries were immediately reported.

The explosion has caused northbound Interstate 77 at the Charleston split to be shut down, West Virginia's Department of Transportation reported on its Twitter account.

The National Transportation Safety Board is sending a team to investigate the explosion and subsequent fire.

A cause was not immediately clear.

CNN iReporter Ryan Dunlap, 28, sent video from the scene, showing flames and smoke in a wooded area.

"We're about a mile away from it. It sounded like an airplane was flying over the roof," he said. "It damaged the Interstate. It's melted. They have all the roads closed down in the area. I had to take the back way home."