DUBAI (Reuters) - Iran’s supreme leader has pardoned “tens of thousands” of prisoners including some arrested in recent anti-government protests, state news agency IRNA reported on Sunday, after a deadly state crackdown helped quell the nationwide unrest.

However, the pardon approved by Ayatollah Ali Khamenei came with conditions, according to details announced in state media reports, which said the measure would not apply to any of the numerous dual nationals held in Iran.

State news agency IRNA said those accused of “corruption on earth” - a capital charge brought against some protesters, four of whom have been executed - would also not be pardoned.

Neither would it apply to those charged with “spying for foreign agencies” or those “affiliated with groups hostile to the Islamic Republic”, state media reported.

Iran was swept by protests following the death of a young Iranian Kurdish woman in the custody of the country’s morality police last September. Iranians from all walks of life took part, marking one of the boldest challenges to the Islamic Republic since the 1979 revolution.