A 15-year-old girl was previously detained on suspicion of the murder in the Stockholm suburbs and of another shooting in Malmö two days later.
Both deny any wrongdoing, but are being held on a higher level of suspicion.
Two more people arrested after murder in Vårby gård
Two more people have been arrested for aiding and abetting the murder of the boy who was shot dead in Vårby gård at the end of March, P4 Stockholm reports.
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