Prosecutors said brothers Ibrahim and Khalid El Bakraoui had carried out attacks at Zaventem airport and Maalbeek metro station, while bomb-making expert Najim Laachraoui was identified by police sources as the second airport bomber.
Authorities yesterday stepped up the manhunt for a third airport attacker, seen wearing a hat and white jacket on CCTV footage from Zaventem departure hall, whose explosive-packed suitcase failed to go off with the two other suicide bombers.
Turkey said it had detained Ibrahim El Bakraoui near the Syrian border in June 2015 and deported him as a "foreign terrorist fighter", piling more pressure on Belgian authorities who have faced criticism for failing to tackle the extremist menace.
Prosecutor Frederic Van Leeuw revealed that Ibrahim had left a desperate "will" on a computer that he dumped in a trash can, in which he said he felt "hunted" and added "I don't know what to do".
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EU justice and interior ministers will convene today in Brussels for an emergency meeting to work out a plan to address the threat posed by jihadists to Europe and the application of EU anti-terrorism laws across the bloc.
Leaders in Europe have reacted with outrage to the twin bombings, vowing to defend democracy and combat terrorism "with all means necessary".
Belgium authorities are under immense pressure over their apparent inability to smash domestic extremist networks, after it emerged that the Paris attacks were largely planned from the country.
Belgian authorities had already been hunting the Bakraoui brothers, both Belgian nationals with long criminal records, over their links to Paris attack suspect Abdeslam.
They also issued a wanted notice for Laachraoui on Monday, the day before the attacks, with officials saying he had travelled to Hungary with Abdeslam last year and that his DNA was found on explosives linked to the Paris rampage.