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A British man has been reported missing following the Brussels attacks and was thought to be on the Metro at the time of the explosion.
David Dixon, originally from Hartlepool in County Durham, has not been in contact with his partner, Charlotte Sutcliffe, since the terror attacks at Zaventem Airport's departure lounge and at Maelbeek Metro station on Tuesday.
He had been travelling to work but did not arrive at his office.
On Facebook, friends have been appealing for information of his whereabouts, asking anyone with information to contact Ms Sutcliffe.
Simon Hartley-Jones, who said he was a "very good friend" of the missing Briton, released a picture of him along with the caption: "He was in the metro system, he didn't arrive to his office and we still haven't reached him."
According to his Facebook page, Mr Dixon studied Economics at Newcastle University and used to work for British Airways.
Others reported missing include brother and sister Sasha and Alexaner Pinczowski from New York who were at Brussels Airport at the time of the explosions.
The first confirmed fatality was Adelma Tapia Ruiz, 27, a Peruvian mother of three-year-old twins.
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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The two explosions killed at least 31 people and injured 198, including two British nationals, according to reports.
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