Vienna: UN Secretary-General Ban Ki-moon said on Friday that Iran should fully cooperate with the International Atomic Energy Agency (IAEA) to clarify controversial aspects of the country's nuclear programme.

"I am deeply concerned by the latest IAEA report indicating that there may be the possibility of a military dimension in Iranian nuclear development programmes," the UN chief as stating during a press conference in Vienna.

Ban said that he has been urging Iranian President Ahmadinejad and all senior authorities of the Iranian government that "the onus is on the Iranian side to prove, to convince the international community that their nuclear development programme is genuinely for peaceful purposes".

Meanwhile, Ban said all outstanding issues should be resolved peacefully through negotiation and dialogue.

"There is no alternative to peaceful resolution on this issue," he said.