Royal Families, Heads Of State Mark Start Of World War I

(Undated) -- The Belgian and British royal families are leading dozens of heads of state in commemorating the start of World War One. Belgium's King Philippe is hosting the event in Liege , the Belgian city where German forces invaded 100 years ago. King Philippe, Britain's Prince William, and others gave short speeches this morning. They'll meet for a reception and commemoration event this evening in Mons .