A public square where candles and flowers had been laid to honor the victims of last Tuesday’s Brussels terror attacks was invaded Sunday by a gang of far-right demonstrators. In a sign of the tensions spreading across Europe in the wake of the airport and metro suicide bombings, between 200 and 400 men made Nazi salutes and chanted anti-immigrant slogans as they forced their way into the vigil at the Place de la Bourse. Violence erupted and riot police used water cannons to push back the protesters. Meanwhile, three additional suspects were arrested in Belgium and a 32-year-old French national was taken into custody in the Netherlands. Belgian investigators are continuing to question Belgian national Fayçal Cheffou, 31, who they believe is “the man in the hat” seen in CCTV footage of the airport bombing suspects. Cheffou was known to police, having served a prison sentence in 2003, when he was 18, for criminal association and complicity to murder, Reuters reported. On Sunday, the State Department confirmed the deaths of two more Americans in the attacks, bringing the total number to four. In all, 35 people were killed and at least 340 injured.