Then called Al-Qaeda in Iraq (AQI) and led by Abu al-Zarqawi (who was later killed by a U.S. air strike in 2006), it then re-emerged in 2011 and seized territory in Northeast Syria, which it uses as...

Then called Al-Qaeda in Iraq (AQI) and led by Abu al-Zarqawi (who was later killed by a U.S. air strike in 2006), it then re-emerged in 2011 and seized territory in Northeast Syria, which it uses as its base of operations, while also seizing large amounts of land and major cities in Iraq in 2014.