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Sen. John McCain, Arizona Republican, condemned President Obama’s Iraq policy in the wake of the explosions.

Mr. McCain, who championed the 2007 troop surge in Iraq, had pushed to keep some 14,000 to 20,000 troops in the country to maintain stability. He said the attacks are just what he had feared.

Mr. McCain and Sen. Lindsey Graham, South Carolina Republican, also issued a statement expressing grave concerns about the arrest warrant issued for Mr. al-Hashimi.

“This is a clear sign that the fragile political accommodation made possible by the surge of 2007, which ended large-scale sectarian violence in Iraq, is now unraveling,” they said.

• Susan Crabtree contributed to this report.