The two delegations are headed by National Security Council Undersecretary Javad Vaeedi and Ollie Heinonen, deputy director of the International Atomic Energy Agency, the Fars News Agency reported.
Ali Asghar Soltanieh, Iran’s ambassador to the IAEA, described the discussions as a continuation of four earlier rounds of talks in Tehran and Vienna, Alalam said.
"The talks will be technical and take two to three days,'' he said.
The agenda includes Iran’s P-1 and P-2 nuclear centrifuges, which are key to its nuclear enrichment program. Iran maintains it is only involved in nuclear research for power generation, while the United States and other countries charge it is interested in acquiring nuclear weapons.