The Brussels-based Islamic State jihadists behind the Paris attacks planned a fresh strike in France but targeted the Belgian capital instead as police closed in, the federal prosecutor said.
Belgium's public prosecutor on Saturday charged four people with being part of a terrorist organisation, adding it was still not clear whether Mohamed Abrini was involved in last month's Brussels Airport bombings.
The arrest of Paris attacks suspect Mohamed Abrini in raids linked to the Brussels airport and metro bombings on Saturday highlighted the ties between jihadists involved in Belgium and France's worst terror outrages.
Mohamed Abrini, wanted over November's Islamic State attacks in Paris, has been arrested in Brussels, Belgian public broadcaster VRT said on Friday, adding that he was probably involved in last month's Brussels bombings.