"An agreement was reached during meetings in Tehran (on Monday and Tuesday) on a process that aims to clarify the so-called alleged studies during the month of May," International Atomic Energy Agency spokeswoman Melissa Fleming said in statement from IAEA headquarters in Vienna.
Iran had given an upbeat assessment on Tuesday of the two days of talks with Olli Heinonen, the IAEA's safeguards chief and top investigator, saying they were "positive" but not saying what was discussed.
Diplomats close to the IAEA had said the point of the talks was to get substantive Iranian responses to claims.
Iranian officials had said Heinonen's visit was intended to "advance cooperation" with the IAEA, the U.N. body which monitors Iran's declared nuclear activity and has been investigating the programme since 2003.
Iran says its nuclear programme is a peaceful drive to produce electricity so that the world's fourth-largest crude exporter can sell more of its oil and gas abroad.
However, the West claims Tehran is seeking technology so it can build atomic weapons.
U.S. President George W. Bush and British Prime Minister Gordon Brown last week vowed to prevent Iran from developing a nuclear bomb, possibly by expanding sanctions.
Last Mod: 23 Nisan 2008, 18:08