It was on May 20 last year that the police stopped a car in Uppsala for a check.
This led to a house search in central Uppsala where drugs, firearms and two explosive devices were found.
One of the explosive charges was fitted and had an electronic remote trigger.
The finding led to an extensive investigation and reconnaissance against a criminal network.
A large part of those involved are suspected of having used the net drug crystal, which the police believe is particularly popular in Uppsala.
SVT has previously mapped the suspects.
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We have been in contact with some of those involved - hear their own words in the clip.
Photo: Pontus Stark / SVT / Linnea Palmgren / SVT Grafik