One person is being held in custody after Belgian police launched two raids in connection with a terror financing probe.
Federal prosecutors said two people were detained following the searches in the Brussels suburb of Anderlecht and the city of Ghent.
One was released after questioning.
No arms or explosives were found during the searches on Thursday, which were part of a probe launched several months ago.
Prosecutors did not link the raids to the suicide attacks on the Brussels airport and subway last year in which 32 people were killed.
Belgian authorities have been on high alert since the bombings last March.