Iranian judicial officials say security forces have arrested 21 alleged Islamic State (IS) extremists in the northeastern city of Mashhad.
Mashhad's Deputy Prosecutor-General Hassan Heidari says some of those arrested are Iranians and others are Afghans who entered Iran with fake documents."
Heidari was quoted by Iranian media on July 7 as saying that some detainees participated in terrorist actions and operations outside Iran.
The arrests follow deadly attacks on June 7 against Iran's parliament and the mausoleum of Ayatollah Ruhollah Khomeini, the founder of the Islamic republic.
IS claimed responsibility for those attacks.
In recent weeks, Iranian authorities have said that dozens of terrorists with links to IS and other groups have been arrested.
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