When was this?
When I was a kid living there, c. 1970, we had an almost identical case kill 3 people, level two houses instantly, and badly damage a third so badly it had to be leveled, in our subdivision. The site was on my walk path to school.
I was in school when it happened, and heard it. Dad was in a staff position at the Pentagon at the time, in a slot that was manned 24/7, so he was at home sleeping, and mom and the next door neighbor were in the kitchen having coffee. They went outside, and insulation was coming out of the sky like snow.
I have a lot of respect for natural gas.
This was in Annandale, Canterbury Woods subdivision.
"When was this?"
Around 1999-2000, in South Riding, Fairfax County. I heard the bodies of the parents and child were blown across the street while they were sleeping.
Back in the 60's, my grandfather woke up and sat at the kitchen table. When he lit up his morning cig, it blew up his house and 2 of his neighbors. Died from 3rd degree burns.