Iraqs Most Senior Shia Cleric Has Issue A Call To Arm Iraq's most senior Shia cleric has issued a call to arms as Sunni-led insurgents sweep across towns. The call by a representative of Grand Ayatollah Ali al-Sistani came during Friday prayers, as the militants widened their grip in the north and east and threatened to march south. The UN says hundreds have been killed - with militants carrying out summary executions of civilians in Mosul. The US and Iran have promised to help fight the insurgency. Source : BBC