Madrid and London terrorist attacks in 2004 and 2005, European counterparts to those carried out in New York and Washington during 2001, have steadily increased EU institutions' concern about the phenomenon of violent radicalization, specially that of Islamist nature, as a possible previous step leading to Jihadist terrorism in a context of a continuous and even growing flow of immigration, namely from Muslim origins. The European Council deems paramount to achieve a deeper cooperation between civil society and authorities towards the prevention of these radicalization phenomena.