Updated 17:15 | Published at 5:12 p.m
14-year-old Mohammad was found dead in Nynäshamn.
Another 14-year-old who was reported missing is now suspected of having been murdered.
The 14-year-old boy from Nyköping who had been missing is suspected of having been murdered.
– I cannot currently comment on whether the detained boy is a suspect in the murder, says senior prosecutor Hanna Cardell, who is the head of the preliminary investigation, in a statement.
A 15-year-old boy is already in custody on suspicion of aiding and abetting kidnapping.
The text is updated.