This is good news for the administration.

U.S. forces have brokered an agreement between Sunni and Shi’ite tribal leaders to join forces against al Qaeda and other extremists, extending a policy that has transformed the security situation in western Anbar province to this area north of the capital.

The extremists struck back yesterday with a suicide car bomb aimed at one of the Sunni tribes involved in the deal, killing three militiamen and wounding 14.

Members of the First Calvary Division based at nearby Camp Taji helped broker the deal on Saturday with the tribal leaders, who agreed to use members of more than 25 local tribes to protect the area around Taji from both Sunni and Shi’ite extremists.

Yesterday’s suicide attack took place at a checkpoint that was set up under the security plan and run by members of the al-Zobaie tribal militia, nicknamed “Freedom Fighters” by the U.S. troops. The Americans say they were attacked daily in the area 12 miles north of Baghdad before Saturday’s deal.

“We want to protect innocent civilians from killing and kidnapping,” said Nadeem al-Tamimi, a Shi’ite tribal leader. “We have been working against al Qaeda for two years and paying for it from our own pocket. But we’re not just against al Qaeda. We’re against all murderers and thieves.”

Shortly after that meeting, Mr. al-Tamimi received a call saying one of his relatives had been assassinated in what was described as a “warning” from the Mahdi Army, a Shi’ite militia nominally loyal to radical cleric Muqtada al-Sadr.

The Mahdi Army fought U.S. troops openly in 2004 when Sheik al-Sadr openly opposed participation in the U.S.-backed Iraqi government. But the militia splintered as sectarian violence increased, and Sheik al-Sadr allowed his followers to participate in the government as an opposition party.

Despite yesterday’s attack, U.S. troops believe they are making headway.

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