The mute video hardly captures the chaos and utter misery of this scene in Nigeria.<br/> <br />At least 81 people were reported killed on Friday when gunmen set off three bombs and opened fire on worshippers at the main mosque in north Nigeria's biggest city, Kano.<br/> <br />The coordinated attack happened as people packed into the courtyard of the ancient mosque for afternoon prayers.<br/> <br />It bore the hallmarks of Islamist Boko Haram militants.<br/> <br />The mosque sits next to the palace of the emir of Kano, an increasingly vocal critic of Boko Haram.<br/> <br />They're trying to revive a medieval Islamic caliphate in the area and consider traditional Islamic authorities with disdain.<br/> <br />Earlier this month, the emir was quoted in the press as calling on Nigerians to defend themselves against the fighters.<br/> <br />The attack comes the same day the Red Cross said more than one million people have fled their homes to escape the Boko Haram insurgency.