Iran's Foreign Ministry wrote in a tweet that late on Sunday that Mujahedin-e Khalq organization (MEK/MKO) is a sect of assassination and fright.
"MEK is by all means a terror cult. Europe is home to this rogue entity & Americans taxpayers' money has funded the atrocities of this corrupt grouplet," Iranian Foreign Ministry wrote on its Twitter account on Sunday.
"Both have hands in the massacre of innocent Iranians by MEK," it added.
Meanwhile, Iranian Foreign Ministry Spokesman Abbas Mousavi in a message on Saturday termed the US and Europe as supporters of the terrorist Mujahedin-e Khalq organization (MEK/MKO) and their crimes.
"39yrs ago, Iran Chief Justice Ayatollah Beheshti & 72senior figures were assassinated by US-, Saddam-backed MEK terrorist cult," Mousavi wrote on his Twitter account on Saturday.
"Since then, MEK has remained under US/Euro auspices, letting it horribly kill & maim 10000+Iranians. Their blood on terrorist MEK supporters' hands!" he added.