APTOPIX Belgium Paris Attacks(01 of17)
Open Image ModalChildren pass a police officer as they arrive for school in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(02 of17)
Open Image ModalChildren pass a police officer as they arrive for school in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
APTOPIX Belgium Paris Attacks(03 of17)
Open Image ModalA Belgian Army soldier patrols in a shopping street in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(04 of17)
Open Image ModalTwo Belgian Army soldiers patrol in a shopping street in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(05 of17)
Open Image ModalTwo Belgian Army soldiers patrol in a shopping street in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(06 of17)
Open Image ModalPolice patrols near a school in Brussels on Wednesday, Nov. 25, 2015. Brussels is keeping its terror alert on highest level but schools and underground transport reopened today. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(07 of17)
Open Image ModalChildren pass by police officers as they arrive for school in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(08 of17)
Open Image ModalA police car patrols near a school in Brussels on Wednesday, Nov. 25, 2015. Brussels is keeping its terror alert on highest level but schools and underground transport reopened today. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(09 of17)
Open Image ModalChildren pass a police officer as they arrive for school in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. (AP Photo/Virginia Mayo) (credit:Virginia Mayo/AP)
Belgium Paris Attacks(10 of17)
Open Image ModalA man wheels a boy on his bicycle past police officers as they arrive for school in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. (AP Photo/Virginia Mayo) (credit:ASSOCIATED PRESS)
APTOPIX Belgium Paris Attacks(11 of17)
Open Image ModalA woman uses an escalator in a subway station as the subway system was partially reopened in Brussels, Belgium, Wednesday, Nov. 25, 2015. Brussels is keeping its terror alert on highest level. (AP Photo/Michael Probst) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(12 of17)
Open Image ModalCommuters embark a subway train as the subway system was partially reopened in Brussels, Belgium, Wednesday, Nov. 25, 2015. Brussels is keeping its terror alert on highest level. (AP Photo/Michael Probst) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(13 of17)
Open Image ModalBelgian Army soldiers and Belgian police patrol a shopping street in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(14 of17)
Open Image ModalTwo Belgian Army soldiers patrol in a shopping street in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(15 of17)
Open Image ModalBelgian army soldiers guard a hospital in Woluwe nears Brussels, Belgium, Wednesday, Nov. 25, 2015. The Belgian government has ordered the health and emergency services in Belgium to take special precautionary measures to make sure their services are not infiltrated by extremists who might launch attacks. (AP Photo/Michael Probst) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(16 of17)
Open Image ModalA Belgian police officer guards the entrance to a subway station as the subway system was partially reopened in Brussels, Belgium, Wednesday, Nov. 25, 2015. Brussels is keeping its terror alert on highest level. (AP Photo/Michael Probst) (credit:ASSOCIATED PRESS)
Belgium Paris Attacks(17 of17)
Open Image ModalPeople wait in line at the administrative office in the center of Brussels on Wednesday, Nov. 25, 2015. Students in Brussels have begun returning to class after a two-day shutdown over fears that a series of simultaneous attacks could be launched around the Belgian capital. Underground transport in Brussels is also slowly starting up again after a four-day closure. (AP Photo/Geert Vanden Wijngaert) (credit:ASSOCIATED PRESS)