Several metro stations in Brussels were closed on Wednesday after a shooting at the central Clemenceau station, the Belgian prosecutor's office said, APA reports citing Reuters.
No injuries were reported, it said.
The suspects fled into the metro tunnels after the shooting incident, a source close to the investigation said, adding that police were looking for two suspects.
Sources close to the investigation told local media the incident may have been drug-related.
Images on VRT's website showed two people walking into the station and opening fire. The images could not immediately be verified by Reuters.