US : U.S. says it has contributed $ 34 million to help refugees . South Sudan will celebrate its first anniversary amid a worsening refugee crisis . About 500 refugees from Haiti have crossed the border . Medecins Sans Haiti describes horrific living conditions in the camps .
NEW : U.S. says it has contributed $ 34 million to help refugees . South Sudan will mark its first anniversary amid a worsening refugee crisis . About 150,000 refugees from Sudan have crossed the border . Medecins Sans Frontieres describes horrific living conditions in the camps .