Belgian soldiers patrol Brussels' Grand Place on November 22, 2015, after security was tightened in Belgium following the fatal attacks in Paris.
Soldiers on patrol in Brussels’ Grand Place.
Image: Reuters/Yves Herman
View of the closed entrance to the metro station "porte de namur" following the terror alert level being elevated to 4/4, in Brussels, Belgium, 23 November 2015.
The Brussels metro remains closed on Monday.
Image: EPA/Laurent Dubrule
Belgian soldiers patrol outside the European Commission headquarters as police searched the area during a continued high level of security following the recent deadly Paris attacks, in Brussels, Belgium, November 23, 2015.
Soldiers on patrol outside of the European Commission’s headquarters in Brussels.
Image: Reuters/Yves Herman
A sign that reads "school closed" is pictured at the entrance of a primary and nursery school in Brussels, November 23, 2015, after security was tightened in Belgium following the fatal attacks in Paris.
Schools in Brussels were closed on Monday.
Image: Reuters/Francois Lenoir
A man walks past the closed entrance to the galerie "toison d'or" following the terror alert level being elevated to 4/4, in Brussels, Belgium, 23 November 2015.
Malls, theaters, restaurants, and many other businesses are closed across Brussels.
Image: EPA/Laurent Dubrule

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