US and Iraqi officials accused Al-Qaeda in Iraq of trying to slide Iraq into a full-scale civil war between Iraq's Shiite population and Sunni Arabs. This was done through an orchestrated campaign of civilian massacres and a number of provocative attacks against high-profile religious targets. With attacks including the 2003 Imam Ali Mosque bombing, the 2004 Day of Ashura and Karbala and Najaf bombings, the 2006 first al-Askari Mosque bombing in Samarra, the deadly single-day series of bombings in which at least 215 people were killed in Baghdad's Shiite district of Sadr City, and the second al-Askari bombing in 2007, Al-Qaeda in Iraq provoked Shiite militias to unleash a wave of retaliatory attacks, resulting in death squad-style killings and further sectarian violence which escalated in 2006. In 2008, sectarian bombings blamed on al-Qaeda in Iraq killed at least 42 people at the Imam Husayn Shrine in Karbala in March, and at least 51 people at a bus stop in Baghdad in June.