Belgium has charged four people with participating in and aiding a terrorist organization, by funding it and recruiting people to fight with Islamic State in Syria.
The Federal Prosecutor's Office said Tuesday the charges followed a police raid of 15 homes in the cities of Antwerp, Ghent and Deinze, during which 15 people were taken in for questioning.
The statement said no arms or explosives were found and the raids had no immediate connection with the IS-claimed attacks on the Brussels airport and a metro station, which left 32 people dead in March.
Belgium has been on alert since the March attacks by home-grown jihadist extremists.
Some of them, who grew up in central Brussels and were known to Belgian authorities, also took part in the November Paris attacks that left 130 people dead.