The suspect is a well-known criminal (NO). The man was previously linked with what the Norwegian Secret Service thinks are organized crime gangs with close contacts to Islamic extremists.
Via News24:
Norwegian police have arrested a suspect who was preparing a deadly attack against a Danish cartoonist behind a controversial caricature of the Prophet Mohammed, a Norwegian newspaper reported on Saturday.
The suspect, who is in his 30s, was detained on Tuesday after Norwegian intelligence discovered Kurt Westergaard was the target of an assassination plot involving automatic weapons and explosives, according to the Dagbladet daily.
(source)