The Wall Street Journal | Gordon Lubold, Nancy A. Youssef and Isabel Coles: Iraqi officials reacted angrily on Friday to American airstrikes against an Iran-backed group on Iraqi soil, contributing to increased U.S.-Iraqi tensions as the two countries attempt to jointly defeat terrorist groups operating there.

The Pentagon said Thursday it had carried out a series of strikes against weapons facilities belonging to Kataib Hezbollah, or KH, an Iran-backed, Shiite militia group based in Iraq that repeatedly has staged rocket attacks against American forces there, U.S. military officials said.

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