Intelligence Minister Mahmoud Alavi did not provide details of the "dozens of spies", or over what period they had been arrested in the interview televised late on Tuesday.

He said Iran had planted the agent "in the cabinet of a country that has a very strong intelligence service". 

The conservative Tasnim news agency said this was a reference to Gonen Segev, a former Israeli energy and infrastructure minister who was charged with spying by a Jerusalem court last month.

"Financially and through other means, our enemies try to get information on our country," Alavi said the interview. 

"They act by spying and infiltration. Fortunately the anti-espionage section is one of the strongest sections of this ministry."

The minister said there was also a concerted effort to root out dual nationals working in official positions.

"If you know anyone, tell us about them," he said.

Alavi spoke of the threat from the Sunni Muslim extremists of the Islamic State group (IS), which sees Shiite-majority Iran as one of its main enemies in the region. 

He said 230 "terrorist cells" had been intercepted over the past year. 

"We foiled plots on places such as universities and the metro but we published little information about this," Alavi said. 

IS carried out a multi-pronged attack on Iran's parliament and the shrine of revolutionary leader Ruhollah Khomeini in June 2017 that killed 17 people.

Alavi also talked about a crackdown by the authorities on corruption and those manipulating Iran's chaotic currency rates, which have been a major focus of discontent in recent months. 

"If we want to have a dynamic economy, we must fight economic corruption. In the intelligence ministry, we have opened 130 files and more than 180 suspects have been arrested," he said.

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