"No arts & craft show will ever obfuscate that Israel is only regime in our region with a *secret* and *undeclared* nuclear weapons program," Zarif said in a tweet.

He called on Israel saying it was "time to fess up and open its illegal nuclear weapons" programme to international inspectors.

The Iranian minister was responding to allegations made by Israeli Prime Minister Benjamin Netanyahu on Thursday in a speech to the UN General Assembly, embellished by ample use of the colourful props that have become his trademark.

Netanyahu held up a map and a photograph of an outwardly "innocent looking compound" which he said was a secret atomic warehouse in Tehran and urged the UN atomic agency to inspect.

"Today, I'm disclosing for the first time that Iran has another secret facility in Tehran, a secret atomic warehouse for storing massive amounts of equipment and materiel from Iran's secret nuclear weapons programme," he said.