The 21-year-old Klaebo finished the race in three minutes and 5.75 seconds to become the youngest Olympic champion in cross country skiing, reports Xinhua news agency.
Klaebo was also the third Olympic champion from Norway in the men's individual sprint event.
"It means a lot. I think it has been a lot of pressure from outside the last couple of weeks and to be able to win here is unbelievable," Klaebo said.
"It is quite cool to cross the finish line first. It is difficult to describe, everything has happened so fast and you are so happy."
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