STORY HIGHLIGHTS
* Belgium's royals and prime minister arrive in Liege to meet those affected by the attack
* Two teenagers, a woman and the attacker are dead, with 75 injured, prosecutor in Liege says
* The 33-year-old gunman left his home in Liege carrying firearms and grenades, the prosecutor says
* The attack was in a busy square where crowds of people were visiting a Christmas market
* Belgium's royals and prime minister arrive in Liege to meet those affected by the attack
* Two teenagers, a woman and the attacker are dead, with 75 injured, prosecutor in Liege says
* The 33-year-old gunman left his home in Liege carrying firearms and grenades, the prosecutor says
* The attack was in a busy square where crowds of people were visiting a Christmas market
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