A home-made armored Caterpillar turns Colorado into Palestine?

Palestine has dead. The authorities ended this one without public
deaths.

Pure chance. They had no absolutely contact with the madman whatsoever
..
If he decided to target a chemical plant and cause a Bhopal-scale
industrial disaster, the cops simply couldn't stop him. In the end an
entire county could get killed.

Do you know enough about the local geography and plants to say
that this sort of thing is possible?

Very detailed description:

http://www.rockymountainnews.com/drm...940309,00.html

....During the attack, according to officials, Heemeyer shot repeatedly
at a number of propane storage tanks at a distributorship with a
..50-caliber weapon. The apparent attempt to trigger a massive explosion
failed....This is just domestic terrorism is what it is....