It sounds like they don't know yet, but it does make one wonder.
Are you in the Atlanta area? I wonder how bad traffic was during this morning's rush hour.
Lived there almost 30 years ago. Married a wife, left and never looked back.
I listened to the live streams last night and the lack of speculation/information on cause was very odd. One anchor misquoted his own reporter in the field, That reporter said that fbi said they had not been called in. The anchor mangles that into "no indication of a criminal act"
That pipe did not set itself on fire.