The United States envoy to the United Nations said the U.S. will do "everything in our power to prevent and respond to mass atrocities" during Sudan's war. Linda Thomas-Greenfield made the comment in a Chad border town on Wednesday as she met with Sudanese refugees who had fled ethnic and sexual violence. Thomas-Greenfield compared the current situation with the atrocities committed in Sudan's Darfur region in the early 2000s. "I have to tell you that I was really shaken to my core by some of the horrors that Sudanese people have endured,” the U.S. envoy said.