A banner marks solidarity at the Place de la Bourse, Brussels.
The Eiffel Tower is illuminated with the colours of the Belgium flag to pay respect.
Flags are hung on the Hotel de Ville.
A man holds a Belgian and a Syrian flag as people gather in front of the Bourse of Brussels.
The Belgian flag projected on the European Union Commission building.
A local Brussels woman holds a paper national flag of Belgium and her daughter a rose.
The Belgian flag projected on Rome's Campidoglio.
Flowers are placed into the mouth of a lion statue as people gather to leave tributes at the Place de la Bourse.
A sign which reads "we need blood, make a donation" is displayed on the ground near sign as mark of solidarity as people leave tributes at the Place de la Bourse.
A woman holds a drawing by French cartoonist Plantu.
People light candles at the Place de la Bourse in Brussels.
A Belgian flag is display on the Trevi Fountain in Rome.
The Royal Palace at Dam Square in Amsterdam displaying the colors of the Belgian flag in tribute to the victims.
A police officer ignites a candle in honour at Beursplein sqaure in Brussels.