Overall, there are between 1,000 and 2,000 seizures of illegal weapons in Sweden per year.
Sven Granath believes that it is difficult to know exactly how many illegal weapons there are in Sweden.
- It is difficult to estimate exactly how many weapons there are, but in Stockholm County we estimate that there are 5,000-10,000, says Sven Granath, criminologist and analyst at the Police Authority.
Hear Sven Granath about why so many illegal weapons from the former Yugoslavia circulate in Sweden in the video.
Watch the entire mini-documentary "In the arms' track" on SVT Play here!