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U.S. Secretary of State Mike Pompeo listens as US President Donald Trump speaks about Syria in the Diplomatic Reception Room at the White House in Washington, D.C., Oct. 23, 2019.

U.S. Secretary of State Mike Pompeo listens as US President Donald Trump speaks about Syria in the Diplomatic Reception Room at the White House in Washington, D.C., Oct. 23, 2019. (Saul Loeb/AFP via Getty Images/TNS)

WASHINGTON - The United States on Friday expressed concern over issues raised at a special meeting of the board of the International Atomic Energy Agency amid rising tensions between Washington and Tehran.

Secretary of State Mike Pompeo said in a statement that the IAEA "detected evidence of potential undeclared nuclear materials in Iran," adding that Tehran "has no plausible explanation" for the materials and calling for an explanation.

Pompeo also called the detention of an IAEA inspector, news of which emerged earlier in the week, "an outrageous and unwarranted act of intimidation."

"IAEA inspectors must be allowed to conduct their critical work unimpeded. We call on Iran to immediately resolve all open issues with the IAEA and to afford Agency inspectors the privileges and immunities to which they are entitled," Pompeo said.

The board meeting was called after Iran announced Thursday that it would begin enriching uranium again at its Fordow nuclear facility at the weekend, a move that contravenes a 2015 international deal that sought to prevent the country from developing nuclear weapons.

The deal has been in jeopardy since May 2018, when the United States withdrew from it and revived sanctions on Tehran that had originally been lifted under its terms.

Visit Deutsche Presse-Agentur GmbH (Hamburg, Germany) at www.dpa.de/English.82.0.html