Iran's Foreign Minister Mohammad Javad Zarif said on Monday some differences still remained between Iran and the six powers over the country's disputed nuclear programme ahead of Tuesday's deadline for a final agreement to end a 12-year-old dispute.
"Still nothing is clear. ... Some differences remain and we are trying and working hard," Mr. Zarif told reporters.
U.S. Secretary of State John Kerry said on Sunday that reaching an >agreement is possible this week if Iran makes the "hard choices" necessary, but if not, the United States stands ready to walk away from the negotiations.
An Iranian official told the semi-official Tasnim news agency that the talks could continue until July 9, echoing some Western diplomats. But Mr. Kerry said negotiators were still aiming for Tuesday's deadline.
Mr. Kerry and Mr. >Zarif held a string of meetings on Sunday, trying to overcome remaining differences, including lifting United Nations sanctions on the country and what advanced research and development Iran may pursue.
Meanwhile, an Iranian official said delegations from the International Atomic Energy Agency (IAEA) will hold talks with Iranian officials on Monday.
