Four were dual Iranian-American citizens. The department says such people are especially at risk.
The alert says "various elements" in Iran remain hostile to the U.S. despite last summer`s nuclear deal. It says Iranian authorities continue to "harass, arrest and detain U.S. citizens."
Because the two countries don`t have diplomatic relations, the U.S. is limited in the help it can provide Americans there. The U.S. generally operates through Swiss intermediaries. But Iran often denies the Swiss consular access to dual nationals.
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