Armed gangs have attacked Haiti’s national prison in Port-au-Prince, enabling an unknown number of prisoners to escape, according to the Le Nouvelliste newspaper and other media outlets. Following an attempt to hold the gangs at bay, the police union issued a call for urgent assistance on Saturday evening, the newspaper reported. Gang violence in the crisis-ridden Caribbean island nation has escalated again after interim President Ariel Henry visited Kenya recently for talks on an international police operation. After months of negotiations and a legal tug-of-war, representatives from both cou…