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The Eiffel Tower lit up in the colours of the Belgian national flag on Tuesday, a mark of solidarity with France’s neighbour to the north, which earlier suffered two devastating terrorists attacks.
Mayor of Paris Anne Hidalgo prompted the move, tweeting that the people of Brussels and Paris are “united.”
She posted: "In solidarity with the people of Brussels, Paris will light up the Eiffel Tower in the colours of the Belgian flag tonight. #Weareunited."
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The Belgian colours were also displayed at the Trevi Fountain in Rome, on the Brandenburg Gate in Berlin, on the town council building in Belgrade and on the Royal Palace at Dam Square in Amsterdam.
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Some 34 people were killed and more than 200 injured after a pair of explosions at the airport in the capital, and later at the Maalbeek Metro Station.
In November last year, 134 people were killed when terrorists launched a series of attacks across the French capital, targeting cafes, the national stadium and a concert hall.
Several of the attackers had links to Brussels, including Salah Abdeslam, who was arrested in Brussels earlier this week having been on the run for crimes connected with the Paris attacks.
The Islamic state group claimed responsibility for both November's Paris attacks, and Tuesday's explosions in Brussels.
In the heart of Brussels, thousands gathered on Tuesday evening to hold a candlelight vigil for those who perished in the blasts. Families left notes of condolences, balloons and flowers in Place de la Bourse. Belgian prime minister Charles Michel joined the crowds.
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People look at the Eiffel Tower illuminated in colours of the Belgian flag in tribute to the victims of terrorist attacks in Brussels, in Paris on March 22, 2016.
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A picture taken on March 22, 2016 shows the Eiffel Tower in Paris illuminated in colours of the Belgian flag in tribute to the victims of terrorist attacks in Brussels.
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Some 34 people were killed and more than 200 wounded in a series of attacks in Brussels on Tuesday.
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The full moon rises behind One World Trade Center on March 22, 2016 in New York, it's mast displaying the colors of the Belgian flag in a show of support following the terrorist attacks in Brussels. / AFP / TREVOR COLLENS (Photo credit should read TREVOR COLLENS/AFP/Getty Images)
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The Palace of Culture, right, the tallest building in the Polish capital, is lit in the colors of the Belgian flag in solidarity with the victims of the attacks in Brussels, in Warsaw, Poland, on Tuesday March 22, 2016.(AP Photo/Czarek Sokolowski)
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One World Trade Center is shown Tuesday, March 22, 2016, in New York. New York Gov. Andrew Cuomo has directed One World Trade Center be displayed in the Belgium colors of black, yellow and red to show solidarity with the nation following attacks that killed dozens of people in Brussels. (AP Photo/Frank Franklin II)
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The Brandenburg Gat is illuminated with the Belgium national flag in reaction to the Brussels attacks, in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
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CITY HALL, NEW YORK, NY, UNITED STATES - 2016/03/22: As a tribute to the memory of the fallen and in solidarity with the Belgian people, the façade of New York City's City Hall was illuminated with the colors of the Belgian flag following the terrorist attacks in Brussels which killed at least 30 people and wounded over two hundred. (Photo by Albin Lohr-Jones/Pacific Press/LightRocket via Getty Images)
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People take selfies in front of the Brandenburg Gate, illuminated with the Belgian national flag in reaction to the Brussels attacks, in Berlin, Germany, Tuesday, March 22, 2016. (AP Photo/Markus Schreiber)
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TREVOR COLLENS via Getty Images
The full moon rises behind One World Trade Center on March 22, 2016 in New York, it's mast displaying the colors of the Belgian flag in a show of support following the terrorist attacks in Brussels. But the tribute from the tallest building in the United States, built on the site of the 9/11 attacks in New York, sparked confusion after a series of published photographs showed the colors to be blue, white and red -- those of the French flag -- that lit up the Trade Center after the November attacks in Paris. An AFP photographer said the colors on the World Trade Center appeared correct to the naked eye, but did not translate accurately in the camera, due to being shot against the dark night-time sky. / AFP / TREVOR COLLENS (Photo credit should read TREVOR COLLENS/AFP/Getty Images)
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San Francisco City Hall is lit with the colors of the Belgian flag as supporters for the victims of the Brussels terrorist attacks show their solidarity during a vigil and moment of silence in San Francisco, California, USA, March 22, 2016. Bombings claimed by the Islamic State group at Brussels airport and on a metro train left around 35 people dead and more than 200 injured in the city that hosts NATO and EU headquarters. / AFP / MONICA DAVEY (Photo credit should read MONICA DAVEY/AFP/Getty Images)
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Nagyardei Stadium is illuminated with the Belgian national colours in Debrecen, 226 kms east of Budapest, Hungary, Tuesday, March 22, 2016 to pay tribute to victims of the terrorist attacks committed earlier Tuesday in Brussels, the capital of Belgium. Dozens of people were killed and more than 200 injured when bombs were detonated at Brussel's Zaventem international airport and at a metro station of the city. (Balazs Mohai/MTI via AP)
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People bring flowers and candles to mourn at the Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
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Members of the public gather at the Place de la Bourse in Brussels to leave messages and tributes following the terrorist bomb attacks.
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People bring flowers and candles to mourn for the victims at Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
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CITY HALL, NEW YORK, NY, UNITED STATES - 2016/03/22: As a tribute to the memory of the fallen and in solidarity with the Belgian people, the façade of New York City's City Hall was illuminated with the colors of the Belgian flag following the terrorist attacks in Brussels which killed at least 30 people and wounded over two hundred. (Photo by Albin Lohr-Jones/Pacific Press/LightRocket via Getty Images)
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The Belgian flag is projected on Rome's historical Trevi Fountain to honor the victims of the deadly attacks at Brussels airport and subway, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and its subway system prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Andrew Medichini)