Media reports broadcasted amateur videos of a man shooting several times neat a station using a large weapon.
Police spokeswoman Ilse Vande Keere said officers arrived at the scene and sealed off the immediate neighbourhood.
A federal prosecutor is investigation where the shooting was in fact conducted with terrorist motivation.
Soccer match abandoned
Just five kilometres away from the incident, the Belgium-Sweden Euro 2024 qualifier football match was being played.
The match, being played at Heysel Stadium, was abandoned at half time after the 35,000 fans in the stands were instructed to remain in the stadium.
“Following a suspected terrorist attack in Brussels this evening, it has been decided after consultation with the two teams and the local police authorities, that the UEFA EURO 2024 qualifying match between Belgium and Sweden is abandoned,” European soccer governing body UEFA said on its website.
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