Iranian Foreign Ministry has issued a statement, criticizing France for allowing a terrorist group to hold a meeting in Paris.

“Necessary protests have been leveled against France for giving permission to the terrorist group,” Foreign Ministry Spokesman Bahram Qassemi said on Sunday, in reference to the Mojahedin-e Khalq Organization (MKO, also known as the MEK, PMOI and NCRI) terrorist group.

“Undoubtedly, France is making a serious mistake about the terrorist group. Terrorists are terrorists anywhere they are, and Paris should avoid double-standards in this regard,” he added.

The MKO, a terrorist group that has killed thousands of Iranian civilians since the Islamic Revolution in Iran, held a meeting on Saturday in Paris. The meeting was attended by some of the former U.S., European and Saudi officials, including Prince Turki al-Faisal, a former Saudi spy chief who also delivered a speech at the event.

Paris hosted another annual meeting of the MKO last year, which was also attended by Faisal.

The MKO fled Iran in 1986 for Iraq and was given a camp by former Iraqi President Saddam Hussein. It fought on the side of Saddam in the Iraqi imposed war on Iran during which the former Iraqi dictator used chemical weapons against Iranian civilians on a massive scale.

The notorious group is also responsible for killing more than 17,000 Iranians in different acts of terrorism, including bombings in public places and targeted killings.