I know someone who works right next door to that building. I just called her to see if she was ok. She said that the building exploded and was not just a collapse.
They think it may have been a gas leak because they had been doing construction on the townhouse.
Construction! I was waiting for that bit of news. My money is on a snake outfit.
Gas leaks can cause some serious devastation. I investigated one once that resulted in the roof of a single family home being blown completely off and landing in a nearby yard. And all the doors and windows were blown out a considerable distance - the front door was sitting on the curb when the firemen arrived.
Turned out it was a deliberate leak for purposes of arson . . . but that's another story!
Looking like I was wrong.