President Obama offers his support to Belgian authorities
A man identified as Faycal Cheffou has been charged with terrorist murder after the Brussels attacks which left 31 people dead.
Cheffou has also been charged with participation in a terrorist group and attempted terrorist killings.
He was one of several men detained in police raids on Thursday.
Belgian prosecutors said a second man, Aboubakar A, has also been charged with participation in the activities of a terrorist group.
In his weekly address, US President Barack Obama offered his support to Belgian authorities in helping find those responsible for the bombings.
Authorities in Belgium and France have carried out numerous raids and made a series of arrests over the last few days as part of a major terror crackdown.
Among those most-wanted is the third suspect in the Brussels airport bombings.
The so-called "man in white" was pictured on CCTV wearing a hat and a light jacket with the two other suspects, moments before they blew themselves up.
He was then seen fleeing the building after his bomb allegedly failed to detonate.
Belgium media reports suggest Cheffou, a freelance journalist, is the third man, however that has not been confirmed by Belgian prosecutors.
Other reports claim the "man in white" is Mohamed Abrini, an alleged acquaintance of detained Paris attacks suspect, Salah Abdeslam.
Belgium remains on high alert following this week's twin attacks at the airport and on a train pulling out of the city's Maalbeek metro station.
One man was shot and wounded by police in Brussels on Saturday after failing to respond to demands to raise his arms.
The man, wearing a backpack, was shot in the leg as he stood with a young girl, thought to be his daughter.
Sky's Mark Stone said it is now thought the shooting may have been in error and that man failed to respond to police because he did not understand French or Flemish.
Brussels airport, meanwhile, has announced it will not reopen for passenger flights before Tuesday.