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Deputy Foreign Minister Danny Ayalon has said that Israel is not bluffing in its threats to take military action against Iran's contentious nuclear program, in remarks broadcast Friday on Sky News.

"The one who's bluffing is Iran, which is trying to play with cards they don't have," Ayalon told the British station. "All the bravado that we see and the testing and the very dangerous and harsh rhetoric is hiding a lot of weaknesses."

The minister's remarks came just a week after the international community proposed a draft nuclear deal that would have seen much of Iran's uranium shipped abroad for enrichment. Iran has demanded changes to the draft but has not yet given its final response.

Ayalon called Iran's tactics in dealing with international power a method of stalling. "If Iranian behavior and conduct continues as they have exhibited so far, it is obvious that their intentions are only to buy time and procrastinate," he said.

Also on Friday, the Guardian reported that the United Nations nuclear watchdog has asked Iran to explain evidence suggesting the Islamic Republic's scientists have experimented with an advanced nuclear warhead design.

The newspaper, citing what it describes as "previously unpublished documentation" from an International Atomic Energy Agency compiled dossier, said Iranian scientists may have tested high-explosive components of a "two-point implosion" device.