UN nuclear chief Mohamed ElBaradei said Monday that there was no deadline for ending an investigationinto Iran's nuclear program.

"It's an open process and we will finish when I believe we are finished," ElBaradei told reporters.

At a board of governors meeting of the International Atomic Energy Agency (IAEA), he said the UN nuclear organization has gained some progress in Iran's nuclear probe with cooperation of Iran and other countries.

The IAEA is close to knowing the origin of uranium enrichment found last year in two Iran's nuclear facilities and has investigated Iran's import, production and use of the centrifuges of uranium enrichment.

But ElBaradei stressed that it is necessary for the IAEA to continue investigation into Iran's nuclear program, which needs Iran to provide further information and cooperation from other countries.

The IAEA board of governors will start a week-long meeting on Sept. 15 to discuss Iran's nuclear issue.

According to diplomats, Britain, France and Germany worked out a draft resolution for the meeting, setting a November deadline for Iran to respond to concern about its nuclear program.

Diplomats said Monday that the draft resolution has not come ondue to differences between the United States and the three European countries.

Hossein Mousavian, representative of the Iranian delegation to the IAEA meeting, said his country is optimistic about the prospect of investigation. He expected the probe to be wrapped up in November.

Iran's nuclear program is peaceful and Iran has answered all the IAEA's questions, the representative said.

Source: Xinhua