"The federal prosecutor notes that certain journalists are reporting information about the investigation under way," a statement said.
"The federal prosecutor urges the press to immediately refrain from conveying information relative to the investigation so as not to harm the inquiry," it said.
Speaking to local television, Belgian Foreign Minister Didier Reynders said: "We fear that people are still at large" following the attacks on Brussels airport and a busy metro station.
Today's attacks come just four days after key Paris attacks suspect Salah Abdeslam was arrested in Brussels following a series of police raids across the city.
On Tuesday last week, police also shot dead a man linked to the November Paris attacks which left 130 people dead, with information gleaned during that raid apparently helping them track down Abdeslam.
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