It would mark the first time the U.S. has lost aircraft in Iranian territory and marks a dramatic escalation in the war since it began five weeks ago.
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Iranian Foreign Minister Mohammad Javad Zarif is warning that any U.S. or Saudi military strike on Iran will result in "all-out war."
Iran's foreign minister says it has surpassed the limit on its stockpile of low-enriched uranium set by the 2015 nuclear deal with world powers.
Secretary of State Mike Pompeo says the Iran nuclear deal was "a loser" with huge repercussions throughout the Middle East.
The U.N. atomic agency announced Saturday that Iran has met all of its obligations under a landmark nuclear deal with six world powers.