On Monday morning, the police raided a number of addresses, in a number of raids in several places in Europe.
According to information to SVT, the raids are linked to an attack on a number of Swedish addresses, which was carried out on Monday morning.
Among other places in Stockholm, Gothenburg and Helsingborg.
Several have also been arrested.
- This strikes at the serious gang crime, both in Sweden and in Europe, says Mikael Damberg.
The operation goes by the name "Trojan Shield" and is described by Europol as a major effort aimed at some of the "world's most influential criminals" in more than a dozen countries.
He leaves the role of the Swedish police to Europol to answer.
On Tuesday, Europol will tell more at a press conference, in which Swedish police participate.
- I can say so much that I am incredibly proud that the Swedish police are so active in these international collaborations, because it really has an effect, also in Sweden, says Damberg.
According to an initiated source to SVT, the operation is still ongoing.