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A few thousand people were gathered at Brussels' Place de la Bourse late Tuesday to draw more messages and light candles.
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The statement promises "dark days" for countries allied against Daesh, threatening that "what is coming is worse and more bitter."
People have taken to social media platforms to express their grief.
In Europe, the FTSE 100 index of leading British shares was down 0.6 percent at 6,149 while Germany's DAX fell 0.5 percent to 9,898.
"The federal prosecutor urges the press to immediately refrain from conveying information relative to the investigation so as not to harm the inquiry," it said.
The palace could not immediately be reached for comment.
The attacks come just days after the main suspect in the Nov. 13 Paris attacks was arrested in Brussels on Friday.
The company says Tuesday the system was put in use within hours of the three explosions at the Brussels airport and a metro station.
He called for concerted efforts by the international community to work at eradicating all forms of terrorism
Two Jet Airways flights, one from New Delhi and the other from Mumbai, had landed at Brussels around the time of the blast.