A few articles focusing on the walling off of primarily Sunni communities in Baghdad as part of the new security plan:

Iraq Getting "Gated Communities"

The U.S. military is walling off at least 10 of Baghdad's most violent neighborhoods and using biometric technology to track some of their residents, creating what officers call "gated communities" in an attempt to carve out oases of safety in this war-ravaged city.

The plan drew widespread condemnation in Iraq this past week. On Sunday night, Prime Minister Nouri-al Maliki told news services that he would work to halt construction of a wall around the Sunni district of Adhamiyah, which residents said would aggravate sectarian tensions by segregating them from Shiite neighbors. The U.S. military says the walls are meant to protect people, not further divide them in a city that is increasingly a patchwork of sectarian enclaves.
U.S. Walls Off Baghdad Neighborhoods

The United States military has begun sealing off Baghdad neighborhoods with concrete walls in a controversial new strategy intended to calm Baghdad's sectarian flashpoints, but residents fear the barriers could deepen divisions between Sunni and Shiite Muslims.

Seven so-called "gated communities" have been or are being built, according to military officials, and more may be coming under the wide-ranging Baghdad security crackdown launched nine weeks ago.

Officials said the walls would help create islands of security by controlling the flow of people and vehicles in some of the city's most violent neighborhoods, and by keeping armed groups from using the areas as launching pads or targets for attacks.

But residents say the barriers actually increase their feelings of isolation and make them feel like targets.

"Don't they realize that when the Baghdad neighborhoods become either Sunni or Shiite, they will become even more vulnerable?" said Yassir Ismail, a 34-year-old Sunni resident of Adhamiyah, one of the areas where the U.S. is putting up barriers. "Extremists from both sides - or mercenaries - will have no more qualms. . . . They will bomb each other to kingdom come."

U.S. officials acknowledged that the gated communities would wall sects off from one another, but they said they were a temporary measure. They're being built in consultation with Iraqi security forces and community leaders, officials said.