The Mad Gasser of Mattoon: A 1940s Poison Gas Terrorist The Mad Gasser attacks took place in Mattoon, Illinois, during the 1940s. True False None Victims of the gas attacks claimed to see a man dressed in black fleeing the scene. True False None The gas was eventually identified as a common household chemical. True False None Some investigators believed the entire panic may have been the result of mass hysteria. True False None The case was officially solved by the FBI in 1945. True False None Time's up Most Popular Most Popular
