The Militia members carrying the heads were identified by locals in Basrah as Haidar Mtashar, Al Fraidawi, & Ali Abood Wadi. They fight under the Banner of HARAKAT MUJAHIDEE AL AHWAR, another offshoot of the former Mahdi Army Militia.
In Basrah, their HQ is right next to that of the Badr Militia headed by former Minister of Transport Hadi Al Ameri. it is a large building on the Tuwasia interchange opposite the electricity distribution directorate.
This event only adds to the real concern that these rouge militias represent as expressed by numerous human rights organisations lately. These Militas are just as brutal as ISIS and will seriously undermine the fragile situation in Iraq. The Boundary between legal authority of the state army and armed elements funded by oil loots and pampered by Iran's Mullah Regime are blurred more by the day.