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Shortly before Mr. al-Hashemi’s arrest warrant was issued, state-run television aired what it said were confessions by men said to be working as his bodyguards. They said they killed Baghdad police officers and officials working in the Health and Foreign ministries in exchange for payoffs from Mr. al-Hashemi.

The hits allegedly began during the height of the war in 2006 and 2007, when widespread violence between Iraq‘s Sunnis and Shiites pitted neighbors against neighbors and killed thousands of Iraqi civilians.

Also Monday, an al Qaeda front group in Iraq claimed responsibility for a November bombing inside Baghdad’s Green Zone, a heavily protected area in the center of the Iraqi capital. Mr. al-Maliki has described the Green Zone bombing near parliament as an assassination attempt against him.

The claim of responsibility by the Sunni militants said the suicide attack was targeting “the head of the Iranian project in Iraq,” an apparent reference to Mr. al-Maliki and the ties of Iraqi Shiites to Shiite-majority Iran. The statement said the attack failed because the car exploded prematurely.

Yahya Barzanji reported from Qalachwalan. Sameer N. Yacoub, Mazin Yahya and Qassim Abdul-Zahra in Baghdad contributed to this article.