It has been a deadly day in Brussels, Belgium. At least two explosions at the airport, another at a subway station. As many as 21 people have been killed, more than 30 wounded. The airport has been shut down – no flights are getting in or out; subway stations have been closed. The terror alert in Belgium is been moved to its highest level. Brussels is headquarters for the 28-member European Union. It is also where one of the masterminds of the Paris attacks in November was arrested in police raids last week.