[Ditto]

A nearly identical gas explosion happened near me about 5 years ago. It totally leveled the house and killed a man inside. Miraculously, his 4 year old granddaughter was blown free from the house and ended up in a neighbors yard. She was injured, but survived.

The houses on either side were totaled and houses for a block around had their windows blown out.

The cause was determined to be damage to a gas main out in the street done five years earlier by an excavator when the houses sewer line was replaced. The gas line eventually began leaking and allowed gas to migrate along the sewer line and into the house.

Here's the NTSB final report.

[PA Engineer]

Thanks for posting that report. I was too tired last night to dig it out.