Belgium has charged one of two brothers with attempting to commit ‘terrorist murder’.
It follows a series of house searches in the region of Mons and in Liege on Friday evening.
No weapons or explosives were found.
But a man identified only as Nourredine H., detained with his brother Hamza on suspicion of planning an attack in Belgium, now also stands accused of participation in the activities of a terrorist organisation.
Hamza was released without charge.
Prosecutors say there is no known connection with the attacks in Brussels in March, in which 32 people were killed. They were claimed by so-called Islamic State.
Brussels, home to European Union institutions and the headquarters of NATO, and Belgium in general are on a security alert level of three out of a maximum of four, a “serious” status with a “possible and probable” threat.