The Wall Street Journal story cited several unnamed diplomats briefed on the matter, who said the locations in which the material was found contributed to suspicions.
Tehran barred inspectors from accessing those same locations for a number of months last year, it said.
The report did not make clear whether the suspected weapons development was recent or old. The International Atomic Energy Agency and Western intelligence services all believe Iran had a clandestine nuclear weapons program until 2003, though Tehran denies ever attempting to obtain such weapons.
The diplomats noted that they themselves did not have specific knowledge about the details of the findings. They said the IAEA was seeking explanations from Iran, and had not yet updated member states on their findings. (Read More)
