I don't know about this being the largest quantity of homemade bombs found in one location within the United States. I seriously doubt it. What about McVeigh? Current story: Alleged Owner of Massive Homemade Bomb Arsenal Is a Mystery Man - FoxNews.com Old incident: Bath, Michigan Bomb 1927 -- US: Bath, Michigan School Disaster. Andrew Kehoe, seeking revenge against the community for taxes imposed on his farm to pay for a new school, set off a TNT bomb in the school, killing 43 people, including 39 grade-school children. After the explosion, Kehoe killed his wife, then drove his truck back, loaded with dynamite & nails, to the school, & set it off, killing himself & the school superintendent.