According to Malcolm Sutton's Index of Deaths from the Conflict in Ireland, part of the Conflict Archive on the Internet (CAIN), the OIRA was responsible for at least 50 killings during the Troubles. According to the book Lost Lives (2006 edition), it was responsible for 57 killings.David McKittrick et al. Lost Lives: The Stories of the Men, Women and Children who Died as a Result of the Northern Ireland Troubles. Random House, 2006. pp. 1551-54
