Marvin John Heemeyer goes on a bulldozer rampage. And he was finally contained, and found dead in his welded shut command compartment.

A 52-year-old welder nursing a grudge against the town fathers and driving a bulldozer converted into a war machine ripped the heart of this high-country ranching town from its foundations Friday.

Among the structures destroyed or heavily damaged in a relentless 90-minute rampage were Granby's town hall and library, a bank, the town's newspaper, an electric cooperative building, Gambles Store, an excavating business and a house owned by the town's former mayor, as well as a concrete plant adjacent to the business of the man believed responsible for the bizarre assault.

Police fired away during the frenzy of destruction, to no avail.

"He's put armored plates all around it and it's impenetrable," said business owner Terri Hertel, her voice trembling as gunfire rattled in the background. "Armor- piercing bullets won't go through it. He's destroying the town of Granby."

Heemeyer was described by acquaintances as a happy-go-lucky snowmobile enthusiast. Vindictive Marvin was also known as "Marv the Muffler Man" from television ads.