Norwegian authorities over the weekend arrested Greg Johnson, the American editor-in-chief of white nationalist outlet Counter-Currents Publishing, hours before he was set to deliver remarks at a far-right conference.

CNN reports Johnson was arrested Saturday before his scheduled speech at the Scandza Forum in Oslo. The network is reportedly known for its anti-Semitic and racist viewpoints.

Johnson was considered “to be a threat, not because of what he could do but because of his hate speech and his previously expressed support for Anders Breivik," Martin Bernsen, a spokesperson for Norway's intelligence service, told CNN.

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Breivik was a right-wing terrorist who killed 77 people, including dozens of young people, in a shooting at a youth camp on Utoya and a bombing in Oslo in 2011.

Norway is attempting to deport Johnson "as quickly as possible to get him out of the country," Bernsen added.

Johnson was arrested under Norway’s immigration act, CNN noted. He was still in Norway as of Sunday and is believed to have hired a lawyer in an attempt to secure his release.

Johnson has refuted reports that he supported Breivik's crimes.

"I have always consistently condemned violence and terrorism," Johnson wrote on the white nationalist site, according to CNN. "In fact, I do not know of anyone else who has so clearly and unequivocally spoken against right-wing terrorism as me."