Iran is not cooperating with international inspectors investigating uranium particles discovered in a Tehran warehouse, the International Atomic Energy Agency's top inspectors told diplomats on Wednesday, according to a Bloomberg report that cited two unidentified officials.
According to the report, IAEA acting Director General Cornel Feruta plans to convene an extraordinary meeting of the body's board of governors on Thursday to discuss concerns over the lack of cooperation.
Meanwhile, U.S. Secretary of State Michael Pompeo said on Thursday that Iran's recent "nuclear escalations" raise concerns that should move all countries to increase pressure on Tehran, as Iran resumed uranium enrichment at one of its nuclear facilities.
"Iran's expansion of proliferation-sensitive activities raises concerns that Iran is positioning itself to have the option of a rapid nuclear breakout," Pompeo said in a statement.
"It is now time for all nations to reject this regime's nuclear extortion and take serious steps to increase pressure. Iran’s continued and numerous nuclear provocations demand such action."
The Wall Street Journal reported in September that Tehran has been unwilling to answer the IAEA's questions about claims – first made by Prime Minister Benjamin Netanyahu last year – that the Islamic Republic held equipment and material used for past work on nuclear weapons at a secret site.
Netanyahu accused Iran at the time of keeping a "secret atomic warehouse" containing nuclear equipment and material in a property near its capital.
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Netanyahu said that the warehouse contained up to 300 tons of nuclear-related material and called on the IAEA to inspect the facility immediately.
Samples taken at the warehouse showed traces of uranium, diplomats said in September.
Reuters contributed to this report.