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Last night, London's landmarks were lit up in the colours of the Belgian flag – black, yellow and red – to pay tribute to the victims of the attacks in Brussels. A 25-metre Belgian flag will be placed on the central staircase in Trafalgar Square this afternoon, ahead of a vigil that's been organised with the Belgian Embassy. From 6pm to 10pm, people will be able to pay their respects, leave flowers and light candles.