 NPR's Windsor Johnston prepared that report. You're listening to NPR News. The U.S. ambassador to the United Nations is headed for Haiti today. Ambassador Linda Thomas-Greenfield is expected to announce more U.S. aid for Haiti. She's also going there to support a Kenyan-led security force that is being deployed to counteract Haitian gangs that have violently destabilized the country. Officers from Kenya have been arriving in Haiti.