"The U.N. nuclear watchdog said it had a 'constructive exchange' with Iran this week but there was no sign of a breakthrough on aspects of its nuclear program that the agency says Tehran has failed to fully address.
The International Atomic Energy Agency (IAEA) is investigating Iran's nuclear program in parallel to talks between Tehran and six world powers that aim to broker a deal by the end of June to scale down the program in exchange for sanctions relief.
In any final deal, the IAEA would play a major role in monitoring Iran's compliance...
The IAEA on Thursday issued a short statement saying it had technical talks with Iranian officials in Tehran on Wednesday, making no mention of major developments."