Denouncing Netanyahu’s claim, Zarif said: “No arts & craft show will ever obfuscate that Israel is only regime in our region with a *secret* and *undeclared* nuclear weapons program.”

No arts & craft show will ever obfuscate that Israel is only regime in our region with a *secret* and *undeclared* nuclear weapons program – including an *actual atomic arsenal*. Time for Israel to fess up and open its illegal nuclear weapons program to international inspectors.

— Javad Zarif (@JZarif) September 27, 2018

He told Israel it was “time to fess up and open its illegal nuclear weapons” programme to international inspectors.

Israel is widely believed to have a nuclear arsenal but has never publicly acknowledged it.

“The only purpose of this is to undercut the reality that Israel is the biggest threat to the region,” he was quoted as saying by the state-run IRNA news agency.

Bahram Qassemi, spokesperson for Iran’s foreign ministry, also dismissed Netanyahu’s claims as “ridiculous and baseless”, according to the Isna news agency.

Qassemi noted that the International Atomic Energy Agency (IAEA) had certified Iran’s nuclear programme as peaceful 12 times in the past three years.

Netanyahu’s comments in New York come four months after US President Donald Trump withdrew from the 2015 nuclear accord, arguing it did too little to rein in Tehran’s nuclear ambitions and triggering the resumption of US economic sanctions on Iran.

An outspoken opponent of the deal, Netanyahu has previously made allegations about Iran’s nuclear activities that are difficult or impossible to verify, including presenting a cartoon bomb to the General Assembly in 2012 warning of how close Tehran was to producing a nuclear device.

In April, Netanyahu presented what he said was evidence of a large secret archive of documents related to Iran’s clandestine nuclear weapons programme at a different site in Tehran.

He said Israeli agents removed vast amounts of documents from that site. At the time, Iran said the documents were fake.