Targeted Killings: Law and Morality in an Asymmetrical World is a non-fiction compilation book about targeted killing edited by Claire Finkelstein, Jens David Ohlin, and Andrew Altman. It was published by Oxford University Press in 2012. The book grew out of contributions by the authors to a conference in April 2011 at the University of Pennsylvania Law School. "Targeted Killings" features eighteen essays in five sections arranged by topic. The work argues that after the 11 September attacks by Al-Qaeda in 2001, the United States and other countries began to see the tactic of targeted killing differently. The practice of targeted killing had previously been accepted in situations of self-defence in military settings; after 11 September 2001 it was used to kill non-combatants and those not directly involved in a particular armed force.