Efforts to hold the European Union together take one step forward, and two steps back. Explosions reported to have killed at least 28 people in Brussels on March 22 undermine recent signs that the union is better together. Violent attacks are rare, especially in western Europe, but high in impact. The risk is that questions of prosperity and fairness that ought to decide the bloc's future get pushed aside.
The attacks targeted the administrative and infrastructural heart of the EU — Brussels airport and the Maelbeek metro station near the European Commission buildings. They come at a time when officials had struck a blow for European unity.