It said in a statement on Wednesday that the spies were involved in disseminating classified information and documents.
The statement added that the trio had been arrested upon a judicial order, without specifying their nationalities, Press TV reported.
Iran’s Intelligence Ministry in July arrested a network of Mossad agents at the western borders, confiscating a large cache of weapons and ammunition that they were planning to use to provoke riots and terror inside the country.
The ministry’s director-general for counterintelligence said that the Mossad agents had been arrested upon sneaking into Iran from the western border posts on the back of an extensive surveillance and intelligence operation.