Iran and six wold powers have opened a new round of talks to settle differences preventing a deal on curbing Tehran's nuclear program.
The talks between Iran and the P5+1 -- Britain, China, France, Russia, the United States, plus Germany -- began on September 19 at the United Nations in New York and were to continue until the end of next week.
The talks may be joined next week by U.S. Secretary of State John Kerry and his counterparts. The deadline for agreement is November 24, putting pressure on both sides to seal a deal.
The P5+1 wants Iran to scale down nuclear activities, such as uranium enrichment, so that it cannot produce nuclear weapons.
Iran, which denies trying to develop nuclear weapons, wants tough UN and Western sanctions to be lifted.