That wasn't what I meant. I read that statement to mean that the local utility does not think that a gas leak caused the explosion.
"Yes, the houses blew up but we didn't find a gas leak afterwards, so as of now, we don't think that that was the cause."
When read that way, you can see why it doesn't make any sense. Once the houses blew up and the pipes were busted everywhere, I'd be very surprised if they found a leak since I assume they would shut the gas off at the nearest (farthest?) point which would prevent any gas from coming out of the busted pipes.