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Heidar Moslehi said Friday that intelligence services in the region have also taken part in the campaign. He did not name other countries.
In the past, Iran has blamed the US, Britain and Israel over the killing of five nuclear scientists. The last assassination was in January. The US and Britain have denied involvement. Israel has not commented.
Moslehi said Western intelligence agencies share sources and information in their operations against Iran.
The West suspects Iran is aiming to produce nuclear weapons and demands limits on Iran's program. Iran insists its nuclear development is aimed at peaceful purposes like power generation.