|Mohamed Abrini the suspect.|
Four of six men arrested on Friday over last month's attacks inBrussels have been charged with terror offences.
The four include key suspect Mohamed Abrini, who was also wanted in connection with the attacks in Paris that killed 130 people last November.
The prosecutors could not confirm whether Abrini was the "man in the hat", the third bomber seen in a video clip in the Brussels airport attacks.
The attacks on the airport and a metro station left 32 people dead.
Besides Abrini, those charged on Saturday were named as Osama K, Herve BN, and Bilal EM.
They are accused of "participating in terrorist acts'' linked to the Brussels bombings.
Two other people arrested on Friday have been released.
Prosecutors said Osama K had been identified as the man seen with the suicide bomber at the Malbeek metro station, and was the man who bought bags used by airport attackers.