Carroll, a freelancer for the Christian Science Monitor, was kidnapped in January 2006 and freed 82 days later.
Shujayri is the second high-ranking Al Qaeda in Iraq figure believed tied to Carroll's abduction to be captured or killed. In May 2007, U.S. forces killed the group's chief propagandist, who was described as a key player in the abduction of Carroll and of peace activist Tom Fox. Fox was kidnapped in November 2005 and found dead the following March.
Violence has declined nationwide in recent months, but deaths still occur daily from attacks tied to sectarian and political rivalries. On Sunday, at least 14 people died in addition to those slain in the Abu Ghraib attack.
A pair of roadside bombs detonated minutes apart in Baghdad, killing three people. One bomb exploded on a busy street, apparently aimed at a police vehicle. Minutes later, another bomb went off, targeting people who had gathered at the scene, including police responding to the first attack.
Iraqi police said three people died. U.S. officials put the death toll at two.
Three men were killed when a bomb hidden in a pile of hay exploded as a group of farmers headed into their fields southeast of Baghdad before dawn.
Three separate attacks in Diyala province killed nine people, police said.
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tina.susman@latimes.com
Special correspondents in Basra, Diyala and Baghdad contributed to this report.