Religious groups prayed for the victims of a deadly Ebola outbreak in West Africa, said to be the worst in history. Several U.S. humanitarian groups are pulling volunteers out of Africa amid reports that health care workers were infected, including two people working on a joint project with the Christian aid group Samaritan’s Purse. Samaritan’s Purse was founded by Franklin Graham, the son of evangelist Billy Graham. Authorities in Sierra Leone, Guinea, and Liberia are working to contain the spread of the disease, which has a fatality rate of up to 90 percent.