The International Atomic Energy Association, the UN’s nuclear watchdog, said it was pleased with talks held with Iranian officials over the state of its nuclear programme, but admitted there was much work to be done.

A team of inspectors have been in Iran since Saturday to address rising fears Tehran has been developing facilities for nuclear weapons.

Herman Nackaerts, deputy director general of the IAEA said: “We are committed to resolving all the outstanding issues and the Iranians certainly are committed too. But of course there is still a lot of work to be done and so we have planned another trip in the very near future.”