A joint operation involving the Guardia Civil, the autonomous police forces of the Basque Country and Catalonia (Ertzaintza and Mossos d'Esquadra) has led to the arrest in Guipúzcoa, a region near the northern border with France, of a 17-year-old Spanish national.

The three police forces consider him to be the main figure in Spain for the neonazi, paedophile and satanist 764 network. This organisation, which, according to the investigation, has for months been generating public alarm through threats targeting educational centres, town councils, libraries and other public and private entities.

Between January and April this year, the teenager is believed to have sent numerous messages announcing shootings and armed attacks. None were carried out, but they were enough for several institutions to activate exceptional security protocols.

In some of these messages, according to police sources, the author claimed that he would broadcast the attacks live so that other members of the organisation could watch them. Threats against a well-known leisure centre and against several individuals are also being investigated.

Searches were carried out on 16 July at two homes in Guipúzcoa linked to the suspect, once the corresponding judicial authorisations had been obtained. Officers seized electronic devices, storage media and documents which are now being analysed. The detainee has appeared before a judge and is subject to a custodial measure in a specialised centre in Donostia/San Sebastián.