Muslim women were deliberately targeted, "confronted" and "intimidated" when right-wing protesters disrupted a peace vigil dedicated to victims of the Brussels attacks.
The women were singled out by a group of 400 far-right protestors at an initially peaceful gathering held to remember the victims of last week's terror attacks in the Belgian capital.
The death toll in the attacks has risen from 31 to 35, with both figures including the three attackers.
The additional deaths include two more American citizens, bringing the total number of US citizens killed in the attack to four.
The latest Americans confirmed to have lost their lives have not been named. Accountants Justin and Stephanie Shults are the other US citizens who died in the bombings at Brussels Airport and Maalbeek metro station.
A formal "march against fear" through the city was cancelled by Belgian police, as they felt they could not ensure the safety of the crowds and wanted to focus on tracking down people involved in the attacks.
Three of the four men arrested on Sunday in connection with the attacks have since been held on charges of terrorism.
But significant police resources were eventually drawn to the Place de la Bourse, where a peaceful crowd containing Muslims and non-Muslims was confronted by around 400 fascists.
They were seen picking out Muslim women from the crowd at the vigil and singling them out for aggressive, confrontational abuse.
The group carried a banner identifying themselves as "Casuals Against Terrorism", indicating probable links with far-right football hooliganism.
Many of the men wore balaclavas or 'Anonymous' masks, and they chanted nationalist, anti-immigrant and anti-Isis slogans.
They also made Nazi salutes and waved flares in the air, before being dispersed by riot police using truck-mounted water cannons.
AFP report that around 10 of the far-right protestors were arrested.
