The man is in his 40s and was arrested in Linköping on Tuesday, the magazine writes.

"The breakthrough has happened because people have gone out and searched commercial DNA records, used by private genealogists, and got a hit," says Lars Olof Lampers, editor of "The Weekly Crime".

The man is now suspected of murdering the then 8-year-old Mohammed Ammouri and 56-year-old language teacher Anna-Lena Svensson the morning of October 19, 2004 on Åsgatan in Linköping.

See more in an interview from SVT's Morgonstudio, when Lars Olof Lampers, editor of "Week's Break", comments on the breakthrough.