Firing rifles into the air from more than 50 Humvees, a convoy of militiamen rolled through the main street of Kifri, 120 kilometers southeast of Kirkuk city, on Nov. 29 – arriving without warning in Kurdish-controlled Iraq.Two local Kurdish security officials and multiple eyewitnesses said that Kifri residents lined the highway, hurling abuse, rocks and water bottles at the Shia forces. Unverified videos posted to social media also captured the scene. Clashes between the local population…