Video: Angelina Jolie visits Syrian refugee camp in Jordan on World Refugee Day World Refugee Day was established by the United Nations to honour the refugees who are forced to flee their homes under threat of persecution, conflict and violence. Speaking at a news conference in Jordan's Zaatari refugee camp, AngelinaJolie called the Syrian civil war is the world's most acute humanitarian crisis and called on world leaders to make diplomatic efforts to end it succeed. The actor spoke at Jordan's largest camp for Syrian refugees, which she toured as special envoy for the United Nations refugee agency. 1.6 million people have poured out of Syria, with nothing but the clothes on their back, and more than half them are children. They have left behind a country in which millions of people are displaced, suffering hunger, deprivation and fear," she said. Jolie is returning to her humanitarian work after announcing last month that she had a mastectomy after discovering she has an inherited genetic mutation that puts her at high risk of breast and ovarian cancer. Her visit to Zaatari camp was her first visit public appearance with the United Nations refugee agency since the double mastectomy. Jolie said that by the end of this year, "half of Syria's population - 10 million people - will be in desperate need of food, shelter and assistance." Jordan hosts more than half a million displaced Syrians, including 185,000 in Zaatari, which has become Jordan's fourth largest populated city.