Guns are not the only deadly weapon for mass killers
USA Today - 10/03/2015
People sufficiently enraged to commit such crimes may also be motivated to find other ways, criminologist James Alan Fox of Northeastern University says.
For example, four children, their mother and grandfather died in a house fire that critically injured their father in McKeesport, Pa., last October. Court documents say Ryan Williams was angry that his father had turned him in to police on a theft charge. Williams faces the death penalty.