As Swedish politicians decided not to gather stats on ethnicity deeming it unimportant, the answer depends on the political affiliation: right-wing politicians

As Swedish politicians decided not to gather stats on ethnicity deeming it unimportant, the answer depends on the political affiliation: right-wing politicians will tell you this is due to immigration, whereas the mainstream answer is that these are just gangs, and their ethnicity/race is unimportant.