Criminal gangs in Sweden has had a bit of a penchant for grenades for some time, thought not at the recent levels. I don't have a lot of data to work with, but

Criminal gangs in Sweden has had a bit of a penchant for grenades for some time, thought not at the recent levels. I don't have a lot of data to work with, but with what I have, my analysis would be roughly like this: The increase in attacks started in 2013 and peaked in 2016 which was when the customs could legally intervene to stop grenade smuggling. There was a weird situation for a while where the customs couldn't legally intervene in smuggling of grenades. In 2016 a new law was introduced that gave the customs some ability to intervene. This chart from SVT (Swedish public service television) news is probably reasonably accurate, excerpt from a link to a news article posted above: https://www.svtstatic.se/image/wide/480/20322774/1544390924?quality=70&format=auto https://www.svtstatic.se/image/wide/480/20322774/1544390924?... Yellow are totals for entire country, and the rest is in the individual cities where grenades has been used. It's interesting to note that in Malmö which "pioneered" the increase in grenade detonations was down to zero in 2018. As it for a time was rather well known to be essentially completely risk free to bring grenades into the country, there might have become a kind of stockpile effect. People who normally wasn't able to get hold of guns and ammunition suddenly could get hold of grenades, and then when you have this heap of grenades in your basement doing nothing, you're likely to use them eventually. It used to be, and I still believe to be the case, that most gangs in Sweden is based, and/or organized from various European countries, mostly eastern European, and Russian I believe. To me it looks more like the usual suspects, using an easily accessible, possibly cheap, weapon. One might interpret the sharp rise as a reaction to some new gang trying to establish themselves, but it's really hard to derive any conclusions because of the weird customs situation regarding grenades the years before, and the fact that the increasing trend up to 2016 started back in 2013. While it could be immigration related, it's not very likely to be refugee related if that was what you were asking?