[rdcbn]

Tanner it's is a two component explosive that, when mixed, can be detonated by an impact from a bullet

The shooter probably intended to use the tannerite as a detonator for an ammonium nitrate (ANFO) bomb made from the ammonium nitrate he had in his possession. ANFO bombs are very powerful explosives but they are very stable and can only be detonated by explosive detonator

The shooter no doubt planned to use a ANFO bomb detonated using tannerite as a detonator ignited by a rifle shot

There may be one or more caches of ANFO/tannerite devices hidden in the area that the shooter never got to set off

Looks like he may have had an escape plan using explosions of fuel tanks and ANFO bombs to create diversions as well as mass casualties

[Reily]

If this is true it’s interesting! It’s not something the ordinary good time Charlie gambler would normally know.
It raises the complexity.

[lacrew]

I never thought about using it as a detonator for a fertilizer bomb...which begs the question: where is the anfo? This guy planned for everything...down to the detail of having a hammer to knock the windows out. Surely he didn't scrap the anfo part of his plan.

I wonder if tannerite would actually set an anfo bomb off...if so I'd expect it to get banned soon.