CEOAFRICA learnt that the US Secretary of State John Kerry has stressed that no agreement has yet been reached on Iran's nuclear programme, during talks in Geneva.

He has joined the UK, French and German foreign ministers for unscheduled talks with Iranian representatives.

According to Kerry, "There are still some things on the table that are unresolved. I want to emphasise there is not an agreement at this point.

"[We] hope to try to narrow the differences but no-one should mistake that there are important gaps to be closed." He said

The French, German and UK Foreign Ministers - Laurent Fabius, Guido Westerwelle and William Hague - have also arrived in Geneva.

Russian Foreign Minister Sergei Lavrov is not expected to attend the talks but Deputy Foreign Minister Sergei Ryabkov is in the city.

A spokesman for UK PM David Cameron said it was hoped the presence of Mr Hague could aid the talks.

"I think people will understand that if the presence of the foreign secretary and some of his E3+3 counterparts can make a contribution, then you would expect us to explore that," the spokesman said.

"It is for Iran to be able to convince the international community that it is able to address the deep concerns that the international community has."

Under a deal that has been floated Iran is expected to halt some enrichment activity for limited sanctions relief.

Israel's PM said he "utterly rejected" such a deal and that his country would not be obliged to abide by it.