Anything in the house could spark it.

Several businesses are totally destroyed. Trees literally are sitting inside of houses.

The bottle hit the floor and broke and sprayed five or six feet.

Fire investigators have seen evidence of ... violations. We are looking into issues regarding [access] and flammability of materials.

Some of these houses, it's just ripped them apart. It's amazing we haven't had more people hurt than we had.

It was clear this person intended to bring the entire building down and a great deal of accelerant was used.