Updated 2016 October 7: As Hurricane Matthew makes its way up the US East Coast, I've updated this post with advice both for would-be givers dodging fake charities, and for those affected by disaster avoiding unscrupulous contractors.
The morning (local time) of Tuesday March 22, 2016, an airport and a metro train station in Brussels, Belgium, were struck by separate but presumably linked explosions (warning: the linked articles contain some disturbing images).
As appalling as it is, major internationally-publicized disasters such as this invariably are followed by "cyber opportunists," criminals who take advantage of the publicity for their own nefarious gain. Two common methods are fraudulent requests for assistance, and malware-laden websites using search engine optimization to appear high in search results for news on the events of today.