A top United Nations agency says the occupied Gaza Strip is "the most dangerous place in the world to be a child" as Israel's military bombardment of the territory kills and injures thousands of children and thousands more suffer from infectious disease and a lack of food, water and medicine in overcrowded, unsanitary hospitals and shelters. As of Wednesday, more than 20,000 Palestinians have been killed by Israeli operations. Among the dead are more than 8,000 children.