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Some of Europe's most famous monuments have been illuminated with the colours of the Belgian flag as a show of solidarity in the wake of a series of terror attacks in Brussels .
As night fell, the Eiffel Tower in Paris was lit up in the black, yellow and red of the Belgian flag.
Berlin's Brandenburg Gate and the Trevi Fountain in Rome were also illuminated out of respect for the victims of the attack.
The Belgian flag was also raised to half mast over Downing Street.
The Eiffel Tower is illuminated with the Belgium national colours (Getty) The Brandenburg Gate is illuminated with the Belgium national flag (AP) The Belgian flag is projected on Rome's historical Trevi Fountain (AP) The Belgian flag flies at half mast above 10 Downing Street in London (PA) At least 31 people were killed and nearly 200 injured in three terror attacks on Brussels Airport and the Maalbeek Metro station.
Isis has claimed responsibility for the attacks.
Show all 27 1 /27Brussels attacks: tributes are paid to the victims Brussels attacks: tributes are paid to the victims Wreaths of flowers in front of an entrance of the Maalbeek subway station in Brussels in homage to the victims of a terrorist attack.
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Brussels attacks: tributes are paid to the victims Wreaths of flowers in front of an entrance of the Maalbeek subway station in Brussels in homage to the victims of a terrorist attack.
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Brussels attacks: tributes are paid to the victims A building illuminated with the Belgian flag colours and a heart in Brussels, two days after suicide bombing attacks of terrorists on March 22 in Zaventem airport and subway Maelbeek.
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Brussels attacks: tributes are paid to the victims A picture taken on 24 March, 2016 on place de la Bourse in Brussels, shows drawings and a candle, two days after suicide bombing attacks of terrorists on March 22 in Zaventem airport and Brussels subway Maelbeek
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Brussels attacks: tributes are paid to the victims Candles are displayed in tribute to the Brussels attacks victims on 24 March, 2016 on place de la Bourse in Brussels, two days after the suicide bombing attacks of terrorists on 22 March.
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Brussels attacks: tributes are paid to the victims A mourner lights a candle in Trafalgar Square during a candlelit vigil in support of the victims of the recent terror attacks in Brussels.
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Brussels attacks: tributes are paid to the victims Brussels airport workers pay tribute to the victims near Zaventem
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Brussels attacks: tributes are paid to the victims Activists light candles and hold placards to condemn the terrorist attacks in Belgium, during a gathering in Manila, Philippines
Brussels attacks: tributes are paid to the victims A banner for the victims of the bombings reads "I am Brussels" at the Place de la Bourse in the center of Brussels
Brussels attacks: tributes are paid to the victims European Commission President Jean-Claude Juncker, left front center, stands with front row, left to right, French Prime Minister Manuel Valls, Belgium's King Philippe, Belgium's Queen Mathilde and Belgian Prime Minister Charles Michel as well as members of the European Commission during a minute of silence at EU headquarters in Brussels
Brussels attacks: tributes are paid to the victims People join hands in solidarity near the former stock exchange following the bomb attacks in Brussels
Brussels attacks: tributes are paid to the victims Belgium flags ornate the facade of the Paris Town Hall
Brussels attacks: tributes are paid to the victims A woman embraces her children at The Place de la Bourse as she pays her respects to victims of the terrorists attacks in Brussels
Brussels attacks: tributes are paid to the victims Belgian and European Union flags fly at half mast following the bomb attacks in Brussels
Brussels attacks: tributes are paid to the victims Candles in the colors of the Belgian national flag are lit inside the Belgian embassy in Madrid, a day after the deadly suicide attacks on the Brussels airport and its subway system
Brussels attacks: tributes are paid to the victims Servicemen of Azov, Ukrainian volunteers battalion, hold torches in front of floral tributes during a ceremony in front of the Belgian embassy in Kiev, in tribute to the victims of Brussels attacks
Brussels attacks: tributes are paid to the victims A refugee boy holds up a placard reading "Sorry for Brussels" at a refugee camp near the Greek-Macedonian border
Brussels attacks: tributes are paid to the victims Brussels tributes People light candles in tribute to victims at a makeshift memorial at the Place de la Bourse in Brussels
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Brussels attacks: tributes are paid to the victims Brussels tributes A woman holds a drawing by French cartoonist Plantu picturing a character made of a French flag consoling another made of the Belgian flag, in front of the Hotel de Ville in Paris
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Brussels attacks: tributes are paid to the victims Brussels tributes The colours of the Belgian flag are projected on to (clockwise from top left) the Eiffel Tower in Paris, the town council building in Belgrade, Rome's Campidoglio and the Royal Palace at Dam Square in Amsterdam
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Brussels attacks: tributes are paid to the victims Brussels tributes Candles are lit in tribute to the victims, at the Place de la Bourse in Brussels
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Brussels attacks: tributes are paid to the victims Brussels tributes A woman holds a placard reading "Paris hearts Belgium, How much time will it take us to open our eyes and say STOP, Today our hearts are broken, Open your eyes to change the future" at the Place de la Republique in Paris
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Brussels attacks: tributes are paid to the victims Brussels tributes People gather to pay a tribute to victims of terrorist attacks in Brussels
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Brussels attacks: tributes are paid to the victims Brussels tributes People write messages on the ground at Place de la Bourse in Brussels
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Brussels attacks: tributes are paid to the victims Brussels tributes A bouquet of flowers in the Belgian national colours with a card reading 'To our neighbours, to our friends, to our Belgian brothers - an indignant Parisian' is seen next to a French national flag at the fence of the Belgian embassy in Paris
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Brussels attacks: tributes are paid to the victims Brussels tributes Solidarity messages are written in chalk outside the stock exchange in Brussels
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Brussels attacks: tributes are paid to the victims Brussels tributes Messages and floral tributes outside the Brussels stock exchange
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Belgian police released a CCTV image showing three suspects moments before the attacks at Brussels Airport which killed at least 11.
Police issued a wanted notice for one of the suspects, who is believed to have survived the attacks.
Shortly after the attacks at the airport, an explosion at the Maalbeek station killed at least 20.
Images of Tintin, the character created by Belgian cartoonist Herge, have been shared widely on social media and the term #JeSuisBruxelles trended on Twitter for much of the day.
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