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.

An Israeli attack on Tehran's Evin Prison on June 23 killed 71 people, according to a spokesperson for the Iranian judiciary said.