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Scores of people have been killed and wounded in attacks at Brussels international airport and a city metro station during the morning rush hour.
There has been heightened security in the Belgian capital since it emerged that several of the men behind last November's Paris attacks had come from Brussels.
Four days ago, a man suspected of involvement in the attacks, Salah Abdeslam, was arrested in Brussels after four months on the run.
Image copyrightBelgian Federal Police/AFPImage caption
A CCTV image released by Belgian officials shows three suspects at the airport
Image copyrightHorst PilgerImage caption
Two blasts tore through the departures hall at Zaventem airport at about 08:00 local time
Image copyrightRalph Usbeck/APImage caption
Eyewitnesses said passengers lay on the ground to protect themselves as smoke filled the terminal
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The scene shortly after the explosions was captured by Ketevan Kardava, from the Georgian Public Broadcaster
Image copyrightMartine RoegiesImage caption
Passengers abandoned suitcases and pushchairs as they fled the scene
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Belgian PM Charles Michel called the attacks "blind, violent and cowardly"
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The force of the explosion blew out windows at the front of the airport terminal
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Hundreds of travellers had to be evacuated
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Little more than an hour after the airport blasts, Maelbeek metro station, near key EU buildings, was attacked
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One eyewitness, Alexandre Brans, said: "The metro was leaving Maelbeek station when there was a really loud explosion. It was panic everywhere."
Image copyrightQuentin GenailleImage caption
A carriage was destroyed in the blast; survivors escaped through a tunnel
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Security has been beefed up in Brussels and many other European cities
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People in Brussels have been gathering in the city's Place de la Bourse where a makeshift memorial has been created
Image copyrightAFPImage caption
The colours of the Belgian flag have lit up the Eiffel Tower in Paris...
Image copyrightAFPImage caption
... the Brandenburg Gate in Berlin...
Image copyrightAFPImage caption
... and the Trevi Fountain in Rome.