To return to the original subject (!!) it certainly now appears that these murderous explosions were very much linked to events of the past couple of weeks in that area of Brussels occupied by many Muslims, and it may even have been the same cell as the Paris bombers or one known to them. Belgium has probably been targeted because their authorities are hopelessly disorganised, with one half not only not knowing what the other half is doing, but having little or no communication with that other half. When I say half, it would probably be more accurate to say one eighth, none of which is properly staffed or resourced. Of course, Belgium is a country that 'managed' without a government for months on end not so long ago and no doubt was earmarked by ISIS and its predecessors years ago as being a soft target.
As I am writing this, two and a bit days after the atrocities, I am hearing on the radio that the families of people missing are being denied access to hospitals to try and locate their loved ones, even children, apparently four of whom are lying in hospital unidentified. The federal government has issued this edict which is being much criticised in Belgium.