KILKIS, Greece – The mayor of the northern Greeke town of Kilkis has been threatened with being killed unless he orders the “removal of all illegal migrants from the area,” state broadcaster ERT reported, with police said to be investigating anti-vaxxers.

The death threat was issued against Dimitris Kyriakidis, whose office received the warning in a document, the report adding that it came from The Guardians of the Constitution, 11 of whose members were arrested earlier for kidnapping a high school mayor for imposing COVID-19 health measures.

The group is known for its defiant opposition to vaccines and health restrictions and virulent social media posts and support for extreme right-wing causes, anti-vaxxers becoming more violent as they’re not required to be vaccinated.

“These people have demonstrated that they are unpredictable, and this is cause for concern. Investigative interest is on around 15 ‘group leaders’ who could potentially drive members into (carrying out) attacks,” ERT quoted a source in the Hellenic Police (ELAS) as saying.

The state broadcaster showed a video posted online by a man with links to an especially combative anti-vaccination group, in which he says that people have the “right and obligation” to arm themselves with “military-grade weapons” against any “threat by an external or internal enemy.”

It also published a “scared declaration” being disseminated over the internet, claiming people have the right to take up “heavy-duty arms” against any politician involved “in the national crime of recognizing Skopje by the name of Macedonia.”

That was in relation to the former Radical Left SYRIZA giving away the name of Macedonia to the now North Macedonia, which had been the Former Yugoslav Republic of Macedonia (FYROM,) Macedonia the name an abutting Greek province.

Greece’s counter-terror unit and intelligence service are said to be monitoring the growing militant presence of at least three groups using extreme right-wing rhetori and trying to whip up people to rebel.