A natural gas explosion has destroyed a residential building in the Oak Cliff area of Dallas, injuring at least one person. Dallas Fire-Rescue told NBC 5 they were called to a large fire triggered by a gas explosion at a residential building on East 9th Street near North Patton Avenue.

An investigation led by the National Transportation Safety Board is still underway to answer questions about what went wrong.

A quiet Matthews neighborhood turned into a construction-zone nightmare on Wednesday when a gas-line explosion sent a fireball and smoke high above the tree line. Two houses were left heavily damaged, several nearby homes were evacuated and roads were shut down, but in a bit of rare good news for a story like this, no injuries were reported.

A law firm filed a lawsuit against Atmos Energy on behalf of Onecimo Ponce Mendoza, a resident of the Dallas apartment complex that exploded after a natural gas pipeline was damaged.

Investigators are working to determine whether proper procedures were followed after a drilling project struck a natural gas line, triggering an explosion at a building site. One of the central questions in the case is whether anyone contacted 8-1-1,