Here is an upsetting but good BBC documentary from 2004 – four years old, but a piece of the war you may have missed:
From the description:
The torture and slaughter of Iraqi civilians is reaching unprecedented heights with estimates of up to 655,000 dead.
Night after night death squads rampage through Iraq’s main cities. In Baghdad, up to a hundred bodies a day are dumped on the streets. Often they’ve been tortured with electric drills. Yet those doing the killing have little to do with al Qaeda or Sunni insurgents. The majority of the killings are carried out by Shia death squads who want to turn Iraq into a Shia state aligned to Iran.
This shocking film investigates the links between the death squads and high-ranking Shia politicians. It reveals how the Shia militia that these politicians control have systematically infiltrated and taken over police units and even entire government ministeries. It investigates how these units are closely linked to the death squads, indeed they often are the death squads. And the killers act with impunity — there’s little investigation into their activities.
For some worthwhile perspective, take a look at this provoking criticism from Iraqi-American blogger Wafaa Al-Natheema who writes:
This documentary’s purpose is neither to resolve the problem nor to pinpoint its origin. The American military and mercenary aggression was typically absent from its content. This documentary is designed to fuel further hatred between Iraqis.
It’s good to approach a documentary like this with the kind of skepticism that critics of western media provide.