The United States did not have Patriot air defenses deployed to al-Asad air base in Iraq, where at least 11 of Iran's ballistic missiles struck.

Tehran had been expected to retaliate against the United States over the killing of a top Iranian general, but had been seen as more likely to strike U.S. positions in countries other than Iraq, where Tehran counts some influential allies. It had moved Patriots last year to Saudi Arabia, for example.

(Reporting by Idrees Ali and Phil Stewart, Editing by Chizu Nomiyama)