Six major countries that used to engage in Iranian nuclear talks on Thursday called on the country to enter fresh dialogues "without pre-conditions."

The six countries, namely the United States, China, Russia, France, Germany and Britain, made the call in a joint statement at a board meeting of the International Atomic Energy Agency (IAEA).

The six world countries have accepted an Iranian offer to revive negotiations after months of stalemate, European Union foreign policy chief Catherine Ashton has said.