In this image taken from video, dead bodies lie on the road near Bentiu, South Sudan, on Sunday, April 20, 2014. The United Nations' top humanitarian official in South Sudan, Toby Lanzer, told The Associated Press in a phone interview on Tuesday, April 22, 2014, that the ethnically targeted killings are "quite possibly a game-changer" for a conflict that has been raging since mid-December and that has exposed longstanding ethnic hostilities. There was also a disturbing echo of Rwanda, which is marking the 20th anniversary this month of its genocide that killed 1 million people. (AP Photo/Toby Lanzer, United Nations)