Puerto Vallarta, Mexico - A new report from the Citizen Council for Public Safety and Criminal Justice reveals that 20 of the world's 50 most dangerous cities are in Mexico, with seven occupying spots in the top ten. The study, which ranks cities based on intentional homicides per 100,000 inhabitants, places Port-au-Prince, Haiti, at the top of the list with a staggering 139.31 murders per 100,000 residents.