We didn't find anything that outwardly appeared to be dangerous or appeared to be an explosive device.

Probably the most dangerous chemical they have that I'm aware of at this point ... is toluene, which can be explosive but it would be hard to ignite.

At the same time, we brought teams of officers to walk through the store looking for anything that appeared to be out of place.

He then began a walk through and search of the entire store with the dog.

There is an explosive mix of methane gas and it is very dangerous.

This is just a chemical reaction, not an improvised explosive device.