On 28 October, Europol supported the CGI of the Spanish National Police (Comisaría General de Información de la Policía Nacional) in arresting three suspects linked to a terrorist cell actively recruiting and indoctrinating young people. The individuals, among which feature the alleged leaders of the cell, were arrested as a result of house searches carried out in San Sebastian and Pasaia in northern Spain. They are believed to have created the terrorist structure to carry out jihadist terrorism in support of the so-called Islamic State.
During planned meetings, the youngest members received physical training and mental conditioning to carry out jihadist terrorism. The terrorist cell enabled the regular practice of contact sports and provided handbooks on the use and handling of weapons such as knives and firearms.