Spiraling violence in Haiti has displaced 680,000 children, nearly twice as many as a year ago, as armed groups tighten control and public services collapse, UNICEF said on Wednesday. The agency estimates that over 6 million people - more than half the population, including 3.3 million children - now need humanitarian assistance. The surge in displacement, combined with deteriorating health and education services and rising gang violence, underscores the growing risks to millions of Haitians, particularly children. "Children in Haiti are experiencing violence and displacement at a terrifying scale," said UNICEF Executive Director Catherine Russell. "Each time they are forced to flee, they lose not only their homes but also their chance to go to school, and simply to be...