The three European countries form part of a six-nation group including the United States, Russia and China due to resume negotiations with Iran in New York on 18th September.

The closed-door discussions in the Austrian capital, announced by European Union foreign policy chief Catherine Ashton's office, follow bilateral US-Iranian discussions in Geneva last week.

A US State Department spokeswoman told reporters on Tuesday that those talks in Switzerland were an "in-depth exchange on the core issues", without giving further details.

The recent diplomatic flurry also saw Iranian Foreign Minister Mohammad Javad Zarif fly to Moscow, Brussels and Paris as well as Rome to meet Ashton's successor Federica ogherini from 1st November.

The P5+1 powers, all of which except Germany sit on the UN Security Council and have nuclear weapons themselves, want Iran to scale back its atomic program.

Tehran, which says its nuclear program is exclusively for electricity generation and medical uses, in return wants painful UN and Western sanctions lifted.

On 18th July, two days before a deadline to get a deal and after months of intense talks, negotiators from Iran and the six powers decided to give themselves until 24th November to nail down the accord.

Latest News from World News Desk