Authorities have escalated a security crackdown on alleged Mossad agents following the 12-day conflict in which Israel attacked nuclear and military sites across the country, killing top commanders and scientists.

Afghan citizen Enayatullah Asghari watched dismayed after Israel and Iran launched strikes on each other last month, as the Gulf nation where he had sought refuge turned more hostile, work on Tehran building sites dried up and he was accused of spying.

The source also disputed suggestions that Iran had time to move enriched uranium stockpiles out of its nuclear facilities before the strikes. "It was stockpiled at Isfahan, Natanz and Fordow and it's now under the rubble," they said.