IAEA acting chief Cornel Feruta said that Iran had not provided any more information about the origin of the particles.
"We have continued our interactions with Iran since then, but have not received any additional information and the matter remains unresolved," he stressed.
"A meeting between the Agency and Iran is scheduled next week in Tehran to discuss it further. It is essential that Iran works with the Agency to resolve this matter promptly," Reuters cited Feruta as saying.
