Belgian authorities are monitoring far-right networks that seek to ignite civil conflict.
The Belgian State Security Service has identified the 'accelerators' – a far-right subculture online that seeks to incite an ethnic civil war – as the most dangerous violent threat from extremists in the country, according to its annual report for 2025.
Accelerationism, also known as 'Siege Culture', along with the Identitarian movement and neo-Nazism, forms the backbone of right-wing extremism in Belgium. Although some of these sub-groups do not advocate violence, accelerators actively promote attacks on minorities to hasten what they see as the collapse of society.
This culture operates through many online chat groups that include Belgian participants. They distribute pamphlets, glorify far-right terrorists as role models, and try to incite others to commit acts of violence. However, most members lack the intent or ability to carry out actual attacks, and their role is limited to sharing their extremist ideology and feelings of hatred.
The State Security Office indicated that in a limited number of cases, there was a real intent and capability to carry out attacks. Accordingly, the occurrence of a terrorist attack inspired by acceleration is considered possible in the 'near to medium term' – that is, from six months to about five years – and these networks are actively monitored in cooperation with international security partners.
In the long term, authorities have warned that far-right movements undermine public trust in democratic institutions and increase extremism, exacerbated by geopolitical instability, the glorification of certain powerful figures, and social polarization. Left-wing extremism, despite some acts of violence, is mostly non-violent and is considered less likely to cause terrorist attacks.