ABSTRACT The 2015 migration crisis and the sudden rise of terror attacks between 2015 and 2017 resulted in the rise of xenophobic sentiments and in associating refugees and asylum seekers with terrorists. This paper investigates the relationship between migration and terrorism by treading in the path of the 2015 migration crisis and seeks to prove that refugees are not terrorists. However, the paper also sustains the hypothesis that right-wing political ideologies, right-wing extremism, ill-treatment of asylum seekers, or restrictive policies could contribute to the radicalisation of refugees in the long term. The paper gives an overview of the 2015 migration crisis and re-examines the most important milestones, such as the Arab Spring, which is considered to be one of the main triggers of the migration influx in Europe. The relationship between migration and terrorism will be analysed along the lines of state terrorism and non-state terrorism, which phenomena’s significance increased after the Arab Spring. While the main aim is to discredit the xenophobic and Islamophobic sentiments, the research reveals that the declaration of the Caliphate – and the resulting migration crisis – indeed contributed to the rise of terror attacks, although not in the form of refugee terrorism. Furthermore, the research also shows that one of the key reasons behind the rising number of terror attacks in Europe is the inadequate Muslim integration that created the breeding ground for homegrown terrorists. Henceforth, the investigation supports the theory that the rise in radicalisation is the key factor behind the growing number of terror attacks; thus, its prevention is the greatest security challenge Europe is facing nowadays, since xenophobic attitude, ill-treatment in refugee camps, and right-wing extremism could lead to the radicalisation of newly arriving refugees.