rallies like these are now a daily occurrence. these fighters told us they consider it a sacred duty to defend their city. across town, markets were far quieter than usual today. most people in baghdad don't believe that isis will come marching into the city, but what they fear is a surge in the number of bombings, and this city already averages about eight a day. a spokesman for the interior ministry: >> our goal is it to liberate our cities. >> reporter: he denies iraq is in the midst of a sectarian civil war and that arming shiite volunteers is a dangerous idea. when you create these shiite militias, it re-ignites those old sectarian tensions. >> we don't have militias. >> reporter: you do have militias. >> we have tribes. >> reporter: i have seen militias. >> no, it is -- >> reporter: badr brigade. >> now we are talking with the tribes.