History of fatal accidents at Iowa AAP Iowa AAP has a history of accidental explosions resulting in multiple fatalities 2 killed in explosion 12 June 2006 5 killed in explosion 7 June 1968 4 killed in explosion 23 June 1967 1 killed in explosion 1 July 1966 4 killed in explosion 18 June 1958 2 killed in explosion 5 May 1955 22 killed in explostion 22 March 1942 13 killed in explosion 13 December 1941 Above cited in Burlington Hawkeye article of 9 June 1968 reporting on 7 June 1968 accident