Media captionPeople applauded in the Place de la Bourse after observing a minute's silence
Two of the suicide bombers who carried out attacks in Brussels on Tuesday have been named as brothers Khalid and Brahim el-Bakraoui, Belgian nationals.
The federal prosecutor said Brahim was part of the attack at Zaventem airport that killed 11 people. Khalid struck at the Maelbeek metro, where 20 people died. In all 260 people were injured.
Police are still hunting another man seen in an airport CCTV image.
Belgium is observing three days of national mourning.
The nation held a minute's silence at midday (11:00 GMT) on Wednesday.
So-called Islamic State (IS) has said it was behind the attacks and warned that more would follow.
On Wednesday, anti-terror police also carried out a raid in the Anderlecht area of the city, making one arrest.
The federal prosecutor, Frederic van Leeuw, denied earlier media reports that the man was wanted jihadist Najim Laachraoui. The arrested man's identity has not been released.
Mr van Leeuw said the two brothers were known to police and had criminal records but these were not related to terrorism. They were identified by DNA records.
He said Brahim el-Bakraoui had left a note saying that people were looking for him everywhere and that if he gave himself up he would end up in a cell.
Media captionBelgian prosecutor Frederic Leeuw: 'We found bomber's written testament'
The RBTF broadcaster, quoting a police source, said that Khalid el-Bakraoui, 27, had used a false name to rent the flat in the Forest area of the Belgian capital where police killed a gunman in a shootout last week.
It was during that raid that police found a fingerprint of Salah Abdeslam, the main suspect in the Paris terror attacks of 13 November.
He was arrested in a raid in Brussels last Friday and is due to appear before a pre-trial court on Wednesday.
Image copyrightReutersImage captionThe airport CCTV image. The man on the left has not been identified and is believed to have died. Brahim el-Bakraoui is in the middle and was also killed. The man on the right has not been identified and is on the runImage copyrightAFPImage captionKhalid el-Bakraoui, the metro suicide bomber, and brother BrahimImage copyrightInterpolImage captionThe Interpol entry for Khalid el-Bakraoui
Khalid el-Bakraoui appears on the Interpol website. It says that he is being sought for terrorist activities.
RTBF said Khalid was jailed in 2011 for carjacking while Brahim, 30, was jailed in October 2010 for firing at police.
Brahim el-Bakraoui is in the middle of the widely circulated CCTV image taken at Zaventem airport, Mr van Leeuw confirmed.
The man on the left is believed to have died at the airport but has not been identified.
Image copyrightEPAImage captionBelgian media says the man in the hat and still being sought is Najim Laachraoui, though prosecutors have not confirmed this
The man on the right has not been identified and is still being sought, Mr van Leeuw said.
He said that this man had a bag of detonators that were left behind and which were later exploded without harming anyone. No other weapons were found at the airport.
Belgian newspaper La Derniere Heure had earlier identified this man as Laachraoui. He was named earlier in the week by police as a wanted accomplice of Abdeslam.
Analysts say Laachraoui is believed to be a key bomb maker, and French media say he also played a major role in the terror attacks in Paris.
Some Belgian media reported on Wednesday that he was the man arrested in Anderlecht but this report has been withdrawn.
Media captionMonuments across Europe were lit up in tribute to Brussels
The first of the victims to be named is Peruvian Adelma Tapia Ruiz, 37.
She had been at Zaventem airport with her Belgian husband and twin four-year-old daughters, who were unharmed, her brother told Peruvian radio.
Belgian Prime Minister Charles Michel, welcoming French counterpart Manuel Valls to Brussels on Wednesday, insisted that "Europe's destiny is peace and security".
He said: "We are more determined than ever to act in the face of enemies of democracy."
The country has raised its terrorism alert to the highest level.
It has also been announced that the international airport will remain closed on Thursday.
Image copyrightAFPImage captionThousands of migrants are stuck on the Greece-Macedonia border
The European Union is preparing to spend hundreds of millions of euros on humanitarian aid, as Greece struggles to cope with an influx of migrants.
Under plans to be submitted on Wednesday, EU funds could be deployed within Europe in the same way they are used to help crises outside the bloc.
The UN has warned of a humanitarian disaster caused by a build-up of migrants on Greece's borders.
Thousands of asylum seekers remain trapped on the border with Macedonia.
The plan to be submitted by the EU's executive body, the European Commission, means EU aid agencies would for the first time work directly with the UN and other groups inside Europe, rather than dispersing money to individual member states.
EU officials said the aid plan would allocate 300m euros (£233m; $325m) this year to help any EU state deal with the migration crisis. In all, 700m euros would be made available over three years.
However, BBC Europe correspondent Chris Morris says that even if such funding can be deployed quickly, the EU also needs to stem the flow of new arrivals. That would mean better co-operation with Turkey, he adds.
Image copyrightAFPImage captionThe camp at Idomeni on Greece's border with Macedonia is overflowing
Greece has asked the European Commission for nearly 500m euros in assistance to help care for 100,000 asylum seekers.
About 24,000 migrants in Greece are in need of housing and more than 8,000 are stuck in worsening conditions on the border with Macedonia.
The crossing at Idomeni has closed following protests by migrants desperate to continue their journey to countries further north, particularly Germany.
Despite the border closure, thousands more migrants and refugees are still travelling to Idomeni. With the camp overwhelmed, many have been forced to wait on buses and at petrol stations along the route from Athens.
Some migrants have been stranded at the overburdened camp for more than a week.
Caroline Haga, an emergency co-ordinator for the International Red Cross (ICRC), said the Greek military had set up three more border camps near Idomeni but all are already full, with about 2,000 people at each.
On Tuesday, the UN refugee agency (UNHCR) warned that Europe was "on the cusp of a largely self-induced humanitarian crisis".
Image copyrightAFPImage captionThe UN has warned of a pending humanitarian disaster
Spokesman Adrian Edwards said crowded conditions on Greece's borders were leading to shortages of food, shelter, water and sanitation.
Last week Macedonia began refusing entry to Afghan migrants and imposing stricter document controls on Syrians and Iraqis, slowing the passage to a trickle.
Then on Monday, Macedonia firmly closed the gate that separates it from the camp, citing the closure by Serbia of its northern border.
A similar knock-on effect has happened previously as Eastern European countries attempt to reduce the number of migrants crossing their borders.
Frustration at the closure boiled over on Monday and scores of migrants clashed with security guards. Some attempted to smash through a fence, prompting the guards to fire tear gas and rubber bullets.
European Council President Donald Tusk is due to visit Croatia and Macedonia on Wednesday before moving on for talks in both Greece and Turkey in advance of a special EU summit next Monday.
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