A blood-red flag was raised over the Jamkaran mosque in the Iranian holy city of Qom last week, one normally reserved to commemorate the death of martyrs. This time, it was intended as a call to arms. ‘We have unfurled this flag so that all [Shia] believers in the world gather around it to avenge Qassem Soleimani’s blood unjustly shed,’ said the mosque’s leader.