A police raid in Madrid on Wednesday resulted in the detention of three suspected Jihadists, El Pais reports.

The arrest comes hours after the latest Brussels incident and is linked to the World Pride 2017 that begins this Friday, June 23 in Madrid. The event is expected to attract over two million visitors.

At least one of those detained is a 32-year old Moroccan linked to ISIS, highly radicalized, and “very dangerous,” having in his possession manuals on preparing a suicide bombing attack. The manual includes a guide to ideological preparation for “martyrdom.”

The other two men, a 33 and a 38-year-old man, also of Moroccan origin, were apparently being trained by their younger housemate to join ISIS.

epa05398107 Madrids Regional President Cristina Cifuentes (2-L), the general coordinator of World Pride 2017 Juan Carlos Alonso (L) and the co-chairs of the event, Brett Hayhoe (2-R) and Sue Poster (R) pose at the Royal Post Office balcony, in Madrid, 29 June 2016, after receiving the baton to Madrid will be the international headquarters of the Gay Pride festivals 2017. EPA/KIKO HUESCA
Madrids Regional President Cristina Cifuentes (2-L), the general coordinator of World Pride 2017 Juan Carlos Alonso (L) and the co-chairs of the event, Brett Hayhoe (2-R) and Sue Poster (R) pose at the Royal Post Office balcony, in Madrid, 29 June 2016, after receiving the baton to Madrid will be the international headquarters of the Gay Pride festivals 2017. EPA/KIKO HUESCA