 Complete the following phrase:  Following the 2003 Invasion of Iraq and subsequent fall of Saddam Husseins regime, the minority Sunni sect, which had previously enjoyed increased benefits under Saddams rule, now found itself out of power as the Shia majority, suppressed under Saddam, sought to establish power. Such sectarian tensions resulted in a violent insurgency waged by different Sunni and Shia militant groups, such as al-Qaeda in Iraq and the Mahdi Army. Following 2006 tens of thousands of people were killed across Iraq, when a civil war between the two Muslim rival sects erupted after the 