The arrests were made as police raided homes overnight yesterday in the Brussels region, seizing two firearms, ammunition, a bullet-proof vest and a quantity of cannabis, the federal prosecutor's office said in a statement.
"In all, five persons were arrested and taken for questioning," it said, adding an investigating judge will decide later today or tomorrow on whether to keep them in custody.
"All persons concerned are suspected of participation (in) the activities of a terrorist group," the statement said.
Nor is it linked to the March 22 bombings in Brussels last year when 32 people were killed and hundreds more wounded. And it is not connected to the Paris attacks on November 13, 2015, which killed 130 people and hurt hundreds more.
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