Al-Qaeda has carried out many attacks on targets which it considers '' kafir '' . Al-Qaeda is also responsible for instigating sectarian violence among Muslims . Al-Qaeda 's leaders regard liberal Muslims , Shias , Sufis and other sects as heretical and its members and sympathizers have attacked their mosques and gatherings . Examples of sectarian attacks include the Yazidi community bombings , the Sadr City bombings , the Ashoura massacre and the April 2007 Baghdad bombings
Sadr City bombings
23 November 2006 Sadr City bombings
Al-Qaeda