A 2005 Human Rights Watch report analysed the insurgency in Iraq and highlighted, "The groups that are most responsible for the abuse, namely al-Qaeda in Iraq and its allies, Ansar al-Sunna and the Islamic State of Iraq, have all targeted civilians for abductions and executions. The first two groups have repeatedly boasted about massive car bombs and suicide bombs in mosques, markets, bus stations and other civilian areas. Such acts are war crimes and in some cases may constitute crimes against humanity, which are defined as serious crimes committed as part of a widespread or systematic attack against a civilian population."[3]