16 September Washington Post - Security Ring for Baghdad Underway by Sudarsan Raghavan.

U.S. military and Iraqi security forces have begun a massive effort to seal off Baghdad with a ring of reinforced checkpoints, berms, trenches, barriers and fences in an attempt to clamp down on insurgents, officials said Friday.

A few dozen checkpoints will be placed along key arteries in and out of Baghdad to ensure that people move through "predictable paths" that can be controlled, Lt. Col. Barry Johnson, a U.S. military spokesman, said late Friday night. Iraqi forces will man the checkpoints and patrol the terrain, with support from U.S. troops...

The construction of a ring around Baghdad would be the most ambitious security endeavor yet for the U.S. military and its Iraqi allies as they try to block militias, death squads and insurgents from funneling in weapons, explosives, funding and recruits from outside the capital...