Christian Tybring-Gjedde, one of Norway's most controversial anti-immigration politicians, has resigned his position as head of the Progress Party in Oslo.

He would not be drawn on the reasons for his departure, saying only that "many episodes have been arduous."

"It's tough being the head of the Oslo Progress Party," he told Aftenposten newspaper. "It is natural that someone else should take the baton and run continue the race."

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