An Islamic State flag was found by the body of a gunman shot in a house raid near Brussels, authorities said.
Two suspects escaped during the anti-terrorism raid, which was linked to the Paris attacks.
School and nursery children in the Forest district of Brussels have been allowed to return home, after schools were put on lockdown following a shootout.
Gunmen opened fire on police during a raid carried out as part of the ongoing investigations into November's terror attacks in Paris.
Several of those responsible had been living in Brussels.
Reports suggested one suspect in the raids has been killed by officers while two others were on the run, but after several hours parents were allowed to head to the schools within the cordon - accompanied by an armed guard - to collect their children.
Belgian Prime Minister Charles Michel said the operation was ongoing.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.