A minute's silence has been held in Brussels to remember the 34 people killed in yesterday's terror attacks.
It came as conflicting reports emerged about the hunt for the third suspect spotted at Brussels airport yesterday before the attacks.
Belgian media said that the suspect police were hunting - named as Najim Laachraoui - had been arrested, but the report was later denied by officials.
The 25 year old was seen on CCTV at Zaventem airport - along with two brothers who are understood to have blown themselves up.
Najim Laachaoui is believed to be an Islamic State bomb-maker who also created devices for the Paris attacks.
He was spotted on CCTV yesterday with two brothers, Khalid and Ibrahim el-Bakraoui, who blew themselves up in the departures area of Zaventem airport in Brussels.
They were allegedly known to police for organised crime, rather than terrorism.
Laachraoui, 24, is also suspected of being responsible for the bombs used in th
e Paris massacres in November after his DNA was found on suicide belts used in the Bataclan Theatre and the Stade de France.
Belgium is starting three days of mourning from today, for the 34 people who died at the airport and at a metro station.
Anti-terror raids have been taking place across the city overnight.
Hours after the explosions - investigators found a nail bomb during a raid in Brussels.
Last night Belgium's King Philippe addressed the nation - saying the 22nd of March will no longer be seen as an ordinary day:
Last night - crowds gathered for a vigil in the centre of Brussels - leaving candles and flowers:
