The Bath School disaster, carried out by Andrew Kehoe on May 18, 1927, remains the deadliest school massacre in U.S. history. In the small town of Bath, Michigan, Kehoe—a school board member and local farmer—spent months secretly planting hundreds of pounds of dynamite and pyrotol beneath the Bath Consolidated School. That morning, some of the explosives detonated, killing students and teachers and injuring dozens, though nearly half of the bombs failed to explode. Shortly afterward, Kehoe drove a truck loaded with additional explosives to the scene, where he detonated it, killing himself and several others, including the school superintendent. In total, 45 people were killed, most of them children. Investigators later uncovered Kehoe’s financial troubles, obsession with taxation, and deep resentment toward the school system, as well as a chilling sign left on his property reading, “Criminals are made, not born,” underscoring the premeditated nature of the attack.

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