Israeli President Shimon Peres warned on Sunday that an attack on Iran is becoming increasingly likely, days before a report by the UN's nuclear watchdog on Iran's nuclear programme is due.

"The possibility of a military attack against Iran is now closer to being applied than the application of a diplomatic option," Peres told the Israel Hayom daily.

"We must stay calm and resist pressure so that we can consider every alternative," he added.

"I don't think that any decision has already been made, but there is an impression that Iran is getting closer to nuclear weapons."

His comments came after he warned in an interview aired by Israel's privately-owned Channel Two television on Saturday that an attack on Iran was becoming "more and more likely."

"The intelligence services of the different countries that are keeping an eye on (Iran) are worried and putting pressure on their leaders to warn that Iran is ready to obtain the nuclear weapon," he said.

In France meanwhile, French Foreign Minister Alain Juppe warned that an attack on Iran would be disastrous.