collapse on itself. >> glen trainor is the former undersheriff of grand county, colorado. when the call first comes in that a bulldozer is on the loose, he isn't overly concerned. but that changes after a report of shots being fired. it turns out, this is no ordinary bulldozer. >> when i arrived on scene and walked around the corner and saw this big behemoth tank there that that was fully encased in armor, i knew that we there a problem that was much bigger than our team could handle on our own. >> the homemade tank is outfitted with high-caliber rifles and is rolling over everything in its path. a few residents grabbed cameras to record the destruction as it happens. >> mad man in grandby. >> the rural sheriff's department is ill-equipped to handle such an attach so trainor calls for backup. >> we made the notification to ask for a larger tactical team and agencies to respond from the denver metropolitan area. and the jefferson county