Grieving: At a bus shelter that was shattered during Tuesday's grenade and gun attack in Liege, Belgium, people gathered today to express their sorrow and pay respects. Philippe Huguen/AFP/Getty Images hide caption toggle caption Philippe Huguen/AFP/Getty Images The Two-Way Terrorism Not Thought To Have Been Motivation Of Attacker In Belgium December 14, 2011 But it still isn't clear why a man attacked a crowded square in Liege, Belgium, on Tuesday with grenades and gunfire, killing at least three people and injuring more than 120. He also apparently killed a woman at his home before the attack.