The fine is for 20,000 Norwegian crowns ($2,352), police chief Ole Saeverud told a news conference.
The two-term prime minister apologised last month for organising an event for her 60th birthday with 13 family members at a mountain resort in late February, despite a government ban on gatherings of more than 10 people.
While the police would not have issued a fine in most such cases, the prime minister has been at the forefront of the government’s work to impose restrictions, police said.
“Though the law is the same for all, all are not equal in front of the law,” said Saeverud, justifying the fine.
“It is therefore correct to issue a fine in order to uphold the general public’s trust in the rules on social restrictions,” he said.
Police said Solberg and her husband, Sindre Finnes, made the decision together to hold a celebration and picked the restaurant, with Finnes taking care of the practical arrangements.
Though police said he had broken the law as well, he was not fined. The restaurant where the celebration took place was also found to have violated the law but it was not fined.
“Solberg is the country’s leader and she has been at the forefront of the restrictions imposed to limit the spread of the virus,” said Saeverud.
The prime minister’s office was not immediately available for comment.
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