NEW : U.S. says it has contributed $ 34 million to help refugees . Comment: Now , aid groups warn that another nightmare looms as millions of people are on the move , desperate to flee fighting and find a safer place to live . About 150,000 refugees from Sudan have crossed the border . Medecins Sans Frontieres describes horrific living conditions in the camps .
NEW : U.S. says it has contributed $ 34 million to help refugees . Comment: About 150,000 refugees from Sudan have crossed the border . Medecins Sans Frontieres describes horrific living conditions in the camps .