Hans Bonte, Mayor of Vilvoorde: "It's a particularly difficult matter following up on these people. It should be the rule that when a Syria-fighter returns the local authorities are informed. This is what was agreed with Home Minister Milquet. However the judicial authorities insist on their independence. As a result you lose control. It's an issue that should be tackled."
Mr Bonte was joined by the burgomasters of the City of Brussels and Maaseik in a call to ensure that local authorities get the necessary information.
Jan Creemers is the Mayor of Maaseik: "Thanks to a dense local network you receive information that could prove vital."