Oslo Police arrested a man on Wednesday that they said stabbed a female and male victim to death earlier in the day in two separate incidents in the capital area.
The woman was found stabbed on Beitevein road in the southeastern suburb of Manglerud. She was declared dead on the spot by first responders.
The man was found on Breigata street in the central Oslo neighbourhood of Grønland. He died at hospital.
Oslo Police said that there is no indication that the two victims knew each other but that both had unspecified connections to the suspect.
The woman was Norwegian, while the man was a Norwegian citizen of another ethnic background, police said.
"I cannot say so much know about who the victims are because it affects our work related to identification and warnings," police spokesman Grete Lien Meltid told NTB.
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VG newspaper reported that the suspect is also a Norwegian citizen of another ethnic background.
The woman's death was reported at 7.38am while a report came in about the male victim at 8.21am.
It was not immediately known if the two incidents were related, but police said the stabbings were reported within minutes of each other on Wednesday morning and they are thus looking into a possible connection.