As Brussels struggled to get back on its feet, criticism of Belgium's handling of the case mounted after the sole suspect to be charged over the metro and airport attacks was freed for lack of evidence linking him to the carnage.
Prosecutors had charged the suspect, known as Faycal C, with "terrorist murder" and were investigating whether he was the third airport attacker who fled after his bomb did not detonate.
The airport, closed since the blasts wrecked the departure hall, was readying to stage a test run today involving hundreds of volunteer staff to determine if it was ready to resume flights, albeit in a very limited capacity, tomorrow.
A temporary check-in facility has been set up and passengers will be subject to extra security checks.
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Brussels Airport chief executive Arnaud Feist told L'Echo daily it could take "months" for the airport to be fully operational again.
Many foreign nationals were among the victims, testament to the cosmopolitan nature of a city that is home to both the European Union and NATO.
Nearly all the fatalities have now been identified. The Indian government today confirmed that a 31-year-old Indian man was on the metro train blown up by a suicide bomber.
While Belgian authorities were quick to identify all three bombers, the inquiry has been dogged by accusations that Belgium missed a series of leads in cracking down on a jihadist network linked to the Brussels attacks as well as the November 13 Paris massacres that killed 130 people.
Hinting at suspicions that the man was a jihadist recruiter, he told French media: "There is a very thin line between an agitated radical and a radical recruiter, and in this case the judge probably didn't want to cross that line."
The man's lawyer Olivier Martins told RTBF television that his client was let go because he had an alibi.
"He gave an alibi based on telephone analysis which showed that he was at home at the time of the attacks," Martins was quoted as saying.