GENEVA - European Union foreign policy chief Catherine Ashton said early Sunday that world powers would reconvene talks with Iran over its controversial nuclear program on November 20.

Talks between the five permanent members of the United Nations Security Council - Britain, China, France, Russia and the United States plus Germany, and Iran over Tehran's controversial nuclear program was extended to an unscheduled third day on Saturday.

Russian Foreign Minister Sergei Lavrov joined the talks one day after his counterparts from the United States, Britain, Germany and France made unscheduled trips to Geneva Friday.

Chinese Vice Foreign Minister Li Baodong also arrived here late Saturday. Their presence indicated a deal may be possible.

However, after three-day talks between the six world powers and Iran, the two sides failed to nail down an interim deal as expected.