Footage shared online showed a man dressed in an orange jacket unloading several shots, using a large weapon. The bearded man was reportedly seen leaving the crime scene on a scooter.
The violent incident came ahead of a qualifier game for the UEFA Euros between Sweden and Belgium at the Heysel Stadium, some three miles away. Local outlets reported a nervous atmosphere near to the arena following reports of the shooting, and extra security measures were added.
The second half of the match was later called off after players reportedly refused to return to the field. A message from the Swedish FA, sent to supporters advised fans to remain inside the stadium.
Footage showed security personnel ushering supporters back inside the stadium and closing the gates. Nearby Metro stations were also reportedly closed.