Iran nuclear: John Kerry says deal 'possible this week'
An agreement on a deal with Iran on its disputed nuclear programme could be sealed this week, US Secretary of State John Kerry says.
He was speaking to reporters in Vienna, where Iran is negotiating with the US and five other world powers.
But Mr Kerry also warned that the two sides were "not where we need to be on several of the most difficult issues", according to BBC. com.
Negotiators face a 7 July deadline. Iran's foreign minister said on Friday that a deal had never been closer.
"If hard choices get made in the next couple of days and made quickly, we could get agreement this week," Mr Kerry said.
Over the past few days, "genuine progress" had been made, he added.
But the US was prepared to walk away "if we don't have a deal and there is absolute intransigence and unwillingness to move on the things that are important".
Iran's Foreign Minister Javad Zarif said that some differences remained and that "still nothing is clear".
But he added that all parties were working hard.
EU's foreign policy chief Federica Mogherini agreed that the atmosphere at the talks was "constructive, positive".
"We are very close," she said.
The so-called P5+1 group - the US, UK, France, China and Russia plus Germany - wants Iran to scale back its sensitive nuclear activities to ensure that it cannot build a nuclear weapon.
Iran, which wants international sanctions that have crippled its economy lifted in exchange, has always insisted that its nuclear work is peaceful.
Sticking points are still reported to be how sanctions are lifted and the amount of nuclear capability Iran is allowed to keep.