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The visit is Mr. Biden‘s seventh since January 2009. He arrived in Iraq after stops in Afghanistan and Pakistan, where the United States has refocused its efforts against al Qaeda and allied extremist groups that threaten American security.

Mr. Biden was last in Baghdad in September for a military ceremony at the end of U.S. combat operations in Iraq.

Iraqi police officials said three mosques — two Sunni and one Shi’ite — were targeted by the roadside blasts Thursday morning. Eleven people also were wounded. The blasts were outside the fortified Green Zone, which houses the U.S. Embassy and Iraqi government offices where Mr. Biden‘s meetings were likely to take place.

The officials spoke on condition of anonymity because they were not authorized to speak to the media.