"Terrorists struck Brussels but it was Europe that was targeted, and all the world that is concerned."- French President Francois Hollande.
Image 1 of 14: Injured people in the Brussels Airport after two explosions were heard. Photo / Twitter
"Terrorists will never win."- Peter Altmaier, chief of staff for German Chancellor Angela Merkel.
"It is with a heavy heart we learned of these ruthless attacks in Brussels ... The world must stand united to defeat terrorism." - Salem Al Meslet, of High Negotiations Committee, a coalition of Syrian opposition groups engaged in peace talks in Geneva.
The attacks "have once again shown terrorism's global face". - Turkish Prime Minister Ahmet Davutoglu.
"It's time for Europe to understand where the genuine threat is coming from and join efforts with Russia." - Prominent Russian lawmaker Alexei Pushkov.