"I hope that Tehran understands that that is not the right way to go," Fischer told rolling news channel NTV.

Under a landmark deal in October with Europe's "Big Three" of Britain, France and Germany, Iran agreed to suspend sensitive uranium enrichment, allow tougher inspections and file a complete declaration of its nuclear activities.

But since then, experts from the UN's nuclear watchdog have discovered omissions in Iran's reporting, inspection visits have been delayed and the regime has backed away from a pledge to stop all enrichment-related efforts.

Fischer said Iran should have an interest "in continuing on the path, through the door that we opened".

Diplomatic sources in Vienna said Wednesday that Iran had removed the seals that the International Atomic Energy Agency had placed on the centrifuges to ensure that Tehran was not using its civilian nuclear program as a cover for a secret weapons program.

Meanwhile in Tehran, the deputy head of the Iranian parliament's foreign policy and security commission, Mohamoud Mohammadi, said the parliament will not ratify an additional security protocol to the nuclear non-proliferation treaty.

The protocol would give UN inspectors increased powers, including the right to carry out inspections without warning.

WAR.WIRE