In Brussels' Place de la Bourse, mourners gathered for a candlelight vigil, laying flowers and writing notes of condolences for the victims of 22 March attacks, which left at least 31 dead and more than 200 wounded. Roads have been closed across the city, and flags are at half mast. Belgian Prime Minister Charles Michel joined the mourners after dark and was joined by European Commission president Jean-Claude Juncker.

Other countries such as Germany, Italy and the US have set up memorials for those who died and suffered in the attacks. People were seen queueing outside the Belgium embassy in Russia to lay down red roses, while mourners in Paris paid homage outside the Hotel de Ville. Berlin saw the illumination of the Brandenburg gate in the colours of the Belgian flag, along with other monuments including the Eiffel Tower, the Trevi fountain and the court of Lyon.

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People hold up a banner as a mark of solidarity at the Place de la Bourse following today's attacks in Brussels, BelgiumCarl Court/ Getty Images
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A woman cries as people gather in front of the Bourse of BrusselsAurore Belot/ AFP
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A replica of the Manneken Pis statue holding the Belgium flag at a makeshift memorial in tribute to victims of terrorist attacksEmmanuel Dunand/ AFP
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People gather to leave tributes at the Place de la Bourse following today's attacks in Brussels, BelgiumCarl Court/ Getty Images

The three attacks, two of which occurred in Zaventem airport and another at Maelbeek metro station, sent shockwaves across Europe and around the world. Authorities are now racing to review security at airports and on public transport, and rekindled debate about European security cooperation and police methods. Belgian police have identified two suspected Islamic State suicide bombers captured on security cameras before they struck Brussels Airport on Tuesday in the first of two attacks that also hit the city's metro, according to reports.

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A woman consoles her children at a street memorial following Tuesday's bomb attacks in Brussels, BelgiumVincent Kessler/ Reuters
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Belgian Prime Minister Charles Michel (R) embraces European Union Commission President Jean-Claude Juncker at a makeshift memorial in front of the stock exchange at the Place de la Bourse (Beursplein) in BrusselsKenzo Tribouillard/ AFP
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Belgian flags fly at half-mast following bomb attacks s in Brussels, BelgiumCharles Platiau/ Reuters
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People stand in front of the Brandenburg gate, which is illuminated in black, yellow and red in the colours of the Belgian flag in tribute to victims of Tuesday's attacks in Brussels, in Berlin, GermanyFabrizio Bensch/ Reuters
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The Eiffel Tower is seen with the black, yellow and red colours of the Belgian flag in tribute to the victims of today's Brussels bomb attacks, in Paris, FrancePhilippe Wojazer/ Reuters
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A sign peace made of candles in front of the Bourse of Brussels in tribute to the victims of the attacksAurore Belot/ AFP
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The court of Lyon is illuminated in colours of the Belgian flag in tribute to the victims of terrorist attacks in BrusselsJeff Pachoud/ AFP
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A man holds a Belgian and a Syrian flag as people gather in front of the Bourse of Brussels in tribute to the victims of Brussels following the attacksAurore Belot/ AFP
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Burj Khalifa in Dubai, the world's tallest tower, is illuminated in colours of the Belgian flag in tribute to victims of the Brussels terror attacksAFP
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The black, yellow, and red colours of the Belgian flag are projected on the Trevi fountain in Rome, ItalyStefano Rellandini/ Reuters
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The town council building in Belgrade illuminated in the colours of the Belgian flag in tribute to the victims of Brussels following attacks in the Belgian capitalOksana Toskic/ AFP
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People gather at a makeshift memorial for the victims of the Belgium attacks in Brussels, at Union Square in the ManhattanStephanie Keith/ Reuters
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A woman wears a Belgian flag and a bag with an inscription reading 'I like Belgium' in front of the Hotel de Ville in Paris as people gather for a tribute to the victims of the Brussels attacksMartin Bureau/ AFP
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A closed street inside a security perimeter set by policemen during searches at the Place Princesse Elisabeth, , as part of the inquiry into today's terrorist attacksJames Arthur Gekiere/ AFP
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A woman holding flowers cries outside the Maalbeek metro station in BrusselsThierry Roge/ AFP
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Brussels shows the frontpage of several newspapers, one day after some 35 people were killed in bombings at Zaventem Airport and on a metro trainPhilippe Huguen/ AFP
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A woman cries in front of the Hotel de Ville in Paris where people gather for a tribute to the victims of the Brussels attacksMartin Bureau/ AFP
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A painting is left as a tribute at the Place de la Bourse following today's attacks in Brussels, BelgiumCarl Court/ Getty Images
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Flowers and a candle for the victims of today's Brussels attacks, are placed on the steps of the Belgian embassy in Berlin, GermanyFabrizio Bensch/ Reuters
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People place flowers for the victims of the Brussels attacks, in front of the Belgian embassy in Moscow, RussiaMaxim Zmeyev/ Reuters
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Tributes are left at the Place de la Bourse following today's attacks in Brussels, BelgiumCarl Court/ Getty Images
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Activists of the Azov civil corp commemorate the victims of today's Brussels attacks near the Belgian embassy in Kiev, UkraineValentyn Ogirenko/ Reuters
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People light candles in tribute to victims at a makeshift memorial at the Place de la Bourse (Beursplein) in BrusselsKenzo Tribouillard/ AFP
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People gather around a memorial in Brussels following bomb attacks s in Brussels, BelgiumCharles Platiau/ Reuters
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People gather at a makeshift memorial for the victims of the Belgium attacks in Brussels, at Union Square in the ManhattanStephanie Keith/ Reuters
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People gather around a memorial in Brussels following bomb attacks in Brussels, BelgiumCharles Platiau/ Reuters