The two boys are from another part of Sweden, according to Norrköpings Tidningar.
Two more boys are being charged with aiding and abetting murder and aggravated weapons offences in connection with the incident in Norrköping, the Prosecution Service said in a press release.
The murder in northwest Oslo took place near a football pitch on April 26 this year. The man who was shot was in his 20s, according to NRK. He was hit by several shots and died in hospital two days later. Norwegian police have said the man was linked to criminal circles.
The murder in Norrköping took place on Walpurgis Night, four days later, at around 9 p.m. There, too, the victim was a man in his 20s.
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