This trend is believed to be the result of re-engagement by specialized insurgent groups, such as the Islamic State of Iraq, who claim affiliation with Al-Qaida in Iraq.
据信这一趋势是伊拉克伊斯兰国等特种叛乱集团再度参与而造成的，该集团声称隶属在伊拉克境内的基地组织。