Belgian prosecutors have charged a man with terrorist offences, in connection with Tuesday’s attacks in Brussels that left 28 people dead.
The man named as Faycal C was arrested on Thursday.
At least half the victims died at the airport, the rest in an attack on the metro in suicide bombings.
The Islamic State (IS) has claimed responsibility for the attacks.
The BBC quoted authorities as saying that Zaventem – Brussels international airport – will not reopen before Tuesday.
Meanwhile a demonstration against the attacks, scheduled for Sunday in central Brussels, has been cancelled after a request from the authorities.
Organisers said people’s security was a top priority.
Belgian prosecutors said that Faycal C had been detained outside the prosecutor’s office in Brussels on Thursday. A search of his home had found no weapons.
Faycal C was charged with “participation in the activities of a terrorist group, terrorist murders and attempted terrorist murders,” a statement said.
It gave no further details and made no comment on Belgian media reports that he was the third man in an airport CCTV image that showed the two suicide bombers – Najim Laachraoui on the left, and Brahim el-Bakraoui.
Belgian media say the third man is Faycal Cheffou, a freelance journalist.
A third man caught on CCTV footage with two bombers who attacked Brussels airport on Tuesday was named as Faycal Cheffou in Belgian media on Saturday.
The federal prosecutor’s office could not immediately be reached for comment.
In a statement on Friday, it had named as “Faycal C” one of three men police had detained near the federal prosecutor’s office, the heavily guarded center of the investigation effort.
It did not say, however, whether he was the third man, seen on CCTV footage wearing a hat and a light jacket at Brussels airport with two other suspects believed to have blown themselves up.
Le Soir newspaper said Faycal C was identified by a taxi driver who drove the attackers to the airport. Earlier it had quoted police sources as saying it was highly likely Faycal Cheffou was the third man.
Other media also carried similar reports and said Cheffou was a freelance journalist.
Nine people in total have been arrested since Thursday in Belgium and two in Germany, as European authorities swoop on Islamic State militants they link to the Brussels bombings that killed 31 people and to the attacks in Paris last November that killed 130