This title presents a study of people who randomly kill large numbers of others (spree killers), or who set out to do so in specific places or situations (mass killers). Because of the ease of obtaining firearms in the USA, many of these, inevitably, are American, but there have been other recent examples in New Zealand and Norway, while three major mass shootings took place in the UK at Hungerford in 1987 (17 dead, including the killer), Dunblane in 1996 (18, including the killer), and in Cumbria in 2010 (13, including the killer).