Police officers of an anti-terrorism unit and of French intelligence agency (DGSI) patrol in a street on Wattignies, northern France, during the operation to pick up a man on suspicion of links to the Kamikaze Riders, an ISIS-related group. Pic/AFP

Four people have been arrested and an arms cache found after overnight terror raids in Brussels linked to a bikers' club called the Kamikaze Riders, federal prosecutors said yesterday.