They plan attacks with limited or no direction from an organisation, making prevention even more difficult.
Many terrorists planning attacks on European soil are themselves Europeans.
The 2000 United Nations Optional Protocol to the Convention on the Rights of the Child on the sale of children, child prostitution and child pornography and, in particular, the 2007 Council of Europe Convention on the Protection of Children against Sexual Exploitation and Sexual Abuse are crucial steps in the process of enhancing international cooperation in this field.
Secondly, terrorist and violent extremist activities in the EU are not the exclusive domain of centralised and hierarchical organisations.
The threat has progressively evolved to include smaller EU-based groups, cells, and lone actors operating in a more unconstrained and unpredictable way.
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