Iran and the United Nations nuclear agency have wrapped up three days of talks on Tehran's controversial nuclear program.
Iran's deputy nuclear negotiator, Javad Vaeedi, described the meetings with the International Atomic Energy Agency as satisfactory, and says discussions between the sides will continue next week.
This week's meetings focused on P-1 and P-2 centrifuges, used for enriching uranium. Iran uses the P-1 centrifuges, but is researching P-2 centrifuges, which are more advanced than the P-1's.
IAEA Deputy Director Olli Heinonen led the delegation for the U.N. side.
Iran and the IAEA agreed in August on a timetable for Tehran to answer questions about its nuclear program by December. The agreement does not require Iran to suspend the current expansion of its uranium enrichment facilities.
The U.N. Security Council has imposed two sets of sanctions on Iran for its refusal to halt uranium enrichment. But world powers have agreed to put off until November efforts to seek a third round of sanctions, to see if Iran's talks with the IAEA produce results.
The United States and its allies accuse Iran of seeking to build atomic weapons under the cover of a civilian nuclear program. Iran denies the charge.
Some information for this report was provided by AFP, AP and Reuters.