Nations Brussels after attack

The Brandenburg Gate is lit in the colours of the Belgian flag.

A man holds a flyer reading 'Against terrorism and hate' at a makeshift memorial in front of the stock exchange at the Place de la Bourse (Beursplein) in Brussels.

The Eiffel Tower in Paris is lit in black, yellow and red, the colours of the Belgian flag.

A woman holds an illustration showing the French flag comforting the Belgian flag.

A boy wearing the Belgian flag stands under the Eiffel Tower in Paris illuminated in colours in tribute to the victims of terrorist attacks.

The town council building in Belgrade

People gather in front of the Hotel de Ville in Paris to show solidarity with Belgians during a commemoration.

The Royal Palace at Dam Square in Amsterdam.

People came for a tribute to victims with candles and a message saying Je suis Bruxelles - Ik ben Brussel, in front of Brussels Bourse.

The Belgian flag is projected on to Rome's Campidoglio.

The San Francisco City Hall is lit with the colors of the Belgian flag.