Swedish gang members from Stockholm and Gothenburg have headed west to Oslo to make the most of their anonymity in Norway and to reap the benefits of wealthy neighbours.
"We have seen a development in recent years where more and more criminals are arriving in Norway from Sweden, and it looks like the trend will continue this year as well," Geir Ellefsen of the Oslo police said in a statement.
The comments came after four Swedish citizens were arrested on Monday, charged with carrying out four burglaries in Oslo in just one week.
Three of the four Swedes were of Somali descent, while the fourth was Iraqi. Oslo police believe the group committed at lease five of the total 30 burglaries reported in the city in January.