VIENNA: Murders have gone down worldwide but half of them still occur in countries with just 11 percent of the global population, in the Americas and Africa, a new United Nations report found on Thursday. The UN office on drugs and crime said 437,000 people were murdered in 2012, compared to 468,000 in 2010, the first year its global study on homicide was conducted. Central America and southern Africa had rates of 26 and 30 people killed for every 100,000, more than four times the world average. Half of all victims were under 30 years old, 80 percent were men as were 95 percent of perpetrators, UNODC said. “There is an urgent need to understand how violent crime is plaguing countries around the world, particularly affecting young men but also taking a heavy toll on women,” said UNODC policy analysis director Jean-Luc Lemahieu.