among the ranks". 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. In February 2014, after a prolonged dispute with Al-Qaeda in Iraq's successor organisation, the Islamic State of Iraq and the Levant (ISIS), Al-Qaeda publicly announced it was cutting all ties with the group, reportedly for its brutality and "notorious intractability". Somalia and Yemen In Somalia, Al-Qaeda agents had been collaborating closely with its Somali wing, which was created from the al-Shabaab group. In February 2012, al-Shabaab officially joined Al-Qaeda, declaring loyalty in a video. Somali Al-Qaeda recruited children for suicide-bomber training and recruited young people to participate in militant actions against Americans. The percentage of attacks in the First World originating from the Afghanistan–Pakistan (AfPak) border declined starting in 2007, as Al-Qaeda shifted to Somalia and Yemen. While Al-Qaeda leaders were hiding in the tribal areas along the AfPak border, middle-tier leaders heightened activity in Somalia and Yemen. In January 2009, Al-Qaeda's division in Saudi Arabia merged with its Yemeni wing to form Al-Qaeda in the Arabian Peninsula (AQAP). Centered in Yemen, the group takes advantage of the country's poor economy, demography and domestic security. In August 2009, the group made an assassination attempt against a member of the Saudi royal family. President Obama asked Ali Abdullah Saleh to ensure closer cooperation with the US in the struggle against the growing activity of Al-Qaeda in Yemen, and promised to send additional aid. The wars in Iraq and Afghanistan drew US attention from Somalia and Yemen.