Top analyst says some 640 Belgians linked to Syria fighting
Belgium has been on its second highest threat level — level three — for more than a year, with soldiers and extra police deployed to guard important public buildings and gatherings.
Van Tigchelt said "an attack is still possible. There is no reason for people to be scared, but we remain at level three."
Thirty-two people were killed on March 22 in suicide bomb attacks on the Brussels airport and subway.






