Iraq in two years, and with six months before the American military is scheduled to leave the country after more than eight years of war.
Wednesday's rocket attack struck a US base in southern Iraq that is located a few miles from Iran, the official said, saying the Iranian link was evident from the type of rockets used.
American intelligence officials believe the Iranian-backed Kataib Hezbollah, also known as the Hezbollah Brigades, is one of the only militias to use weapons known in military jargon as irams, or improvised rocket-assisted mortars, against US troops. They are made in Iran.
The militia has links to the Lebanon-based Hezbollah group and is solely focused on attacking US troops and other American personnel.
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