"Otherwise, I cannot at this time go into more detail about what the suspicions consist of," writes prosecutor Moa Drakenberg in an email to the newspaper.
A 15-year-old girl is being held in custody on suspicion of the murder in Vårby gård on March 23, as well as another murder in Malmö a couple of days later.
According to Aftonbladet, the three who have now been detained are also 15-year-old girls.
Two other people have already been detained, also suspected of being accessories.
A total of six people are now in custody on suspicion of involvement in the murder, including the suspected shooter.
