In some ways, the most worrying thing about 2016 is that there are still more than five months of it left. Given just how much bad news has been packed into the year so far, the question has to be asked - what else could go wrong?
It may well be that the mass casualty assaults in Paris, Brussels, Nice, Munich and Orlando - as well as a smattering of smaller attacks in France and Germany in particular - are only the beginning. Not all are necessarily linked to Islamist militant groups, but in each case they are raising the temperature of local domestic politics in a distinctly dangerous way.