 The Danish Security and Intelligence Service judged the number of jihadis in Sweden to be a threat against Denmark since two terrorists arriving from Sweden had already been sentenced in the 2010 Copenhagen terror plot.In March 2018 Kurdish authorities reported they had captured 41 IS supporters with either Swedish citizenship or residence permit in Sweden, of which 5 had key positions in the organisation and one was the head of the ISIL propaganda efforts.According to interviews with authorities in November 2018, about half of those some of those who joined the Islamic State and other groups in the Syrian Civil War had returned to Sweden.