Authorities were first called to Clemenceau train station at around 6 a.m. (12:00 a.m. ET) on Wednesday, said Willemien Baert, a spokesperson for the public prosecutor’s office. No one was injured, Baert added.
Video surveillance images showed two suspects creeping into the city’s public transport tunnels, the prosecutor’s office added, however, triggering a search operation and investigation.
Police have cordoned off the area, where several cartridge cases were found. No one has yet been arrested in connection to the shooting, which officials do not believe is terror-related.
The subsequent police operation temporarily closed Clemenceau and the nearby Midi metro station until 2 p.m. local time, Reuters reported. The latter is an arrival point for Eurostar trains from other major European capitals – including London and Paris.
Major global institutions, including the European Union (EU) and the North Atlantic Treaty Organization (NATO), are also headquartered in Brussels.
Public broadcaster VRT reported earlier that the events were probably drug-related, adding that the shooters had aimed at one person but had missed.
Images from VRT showed two people walking into Clemenceau metro station, before unleashing fire. Another clip showed masses of heavily armed police assembling at the station after the search for the suspects got underway.
The images could not immediately be verified by Reuters.
This story has been updated with additional developments.