BRUSSELS, BELGIUM - NOVEMBER 22: Soldiers and police patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Belgian soldiers with armored vehicles patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Belgian soldiers with armored vehicles patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Soldiers and police patrol in an airport, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Soldiers and police patrol in an airport, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Belgian police officers patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Belgian police officers patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Belgian soldiers patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)
BRUSSELS, BELGIUM - NOVEMBER 22: Police dog checks a bag, which caused panic, as soldiers and police patrol in streets, in Brussels where all stores had to close following the terror alert level being elevated to 4, in Brussels, Belgium, on November 22, 2015. Belgium raised the alert status at Level 4 as 'serious and imminent' threat of an attack, the main effect are closing of all metro line in Brussels, all soccer match of leagues cancel in all country. (Dursun Aydemir - Anadolu Agency)