Iraqi police aboard a vehicle provide security outside the damaged Golden Mosque in Samarra, about 96km (60miles) north of Baghdad in this March 6, 2006 file photo. Suspected al Qaeda militants blew up two minarets of the revered Shi'ite mosque in the Iraqi city of Samarra on June 13, 2007, targeting the shrine bombed last year in an attack that unleashed a wave of sectarian killing. Fearing renewed bloodshed, Iraq's government imposed an indefinite curfew in Baghdad as Shi'ite and Sunni political and religious leaders called on their followers to remain calm.