The IAEA Board of Governors convened a meeting to discuss “safeguards matters” in Iran. An IAEA spokesperson subsequently confirmed that “an Agency inspector was last week temporarily prevented from leaving Iran”. “Preventing an inspector from leaving a country, particularly when instructed to do so by the IAEA”, the statement added, “is not acceptable and should not occur”. Iran asserted that “security control machines sounded the alarm” when the inspector was at the Natanz site, “and denied her entry”; Tehran’s IAEA ambassador stated that “Iran has security concerns… and does not intend to violate immunity of IAEA’s inspectors”. The IAEA indicated that “based on the information available to us, the Agency does not agree with Iran’s characterisation of the situation involving the inspector”. In a statement, the U.S. asserted that “Iran’s detention of this inspector was without question an outrageous and unwarranted act of intimidation”. It also indicated that “the IAEA has detected evidence of potential undeclared nuclear material in Iran. Iran has no plausible explanation for the detected material and must explain where it came from and where it is now”. Secretary of State Pompeo in a statement the following day indicated that “the U.S. is deeply concerned with the issues the IAEA raised”, and “alarmed at Iran’s lack of cooperation”.