US Secretary of State, John Kerry, has said that an agreement on a deal with Iran on its disputed nuclear programme could be sealed this week.
Iran is negotiating with the US and five other world powers in Vienna.
Mr Kerry also warned that the two sides are not where they need to be on several of the most difficult issues.
With negotiators facing a July 7 deadline, Iran’s Foreign Minister, Javad Zarif, said a deal had never been closer.
He believes that if hard choices are made in the next couple of days and made quickly, then an agreement is possible this week.
He added that over the last few years, genuine progress has been made.
Meanwhile, the European Union (EU) Foreign Policy Chief, Federica Mogherini, agreed that the atmosphere at the talks was constructive and positive.
“We are very close,” she said.
