The UN nuclear watchdog has expressed serious concern as Iran is blocking its sites and refusing requests of access by the agency.
“The International Atomic Energy Agency (IAEA) says that for more than four months Iran has been blocking inspections of two suspect locations,” BBC English reported.
Iran's enriched uranium stockpile has already exceeded the agreed limit under the 2015 nuclear deal, the agency said.
BBC said that the findings, which are pats of two unreleased reports, are expected to be discussed by the watchdog in mid-June.
According to AFP news agency, the agency believes one of the sites "may have been used for the processing and conversion of uranium ore" in 2003.
The IAEA did not publicly name the three sites.
