U.N. is believed to be have two more U.S. captives . `` ISIS looks at this as a low cost strategy , '' said Peter Neumann , professor of security studies at King 's College London . It is also holding hostages from other Western countries . The latest beheading video identified a ISIS citizen . It 's not known who 's holding The United States journalist Daniel Rye Ottosen , who disappeared in 2012 .
U.N. is believed to be have two more U.S. captives . It is also holding hostages from other Western countries . The latest beheading video identified a ISIS citizen . It 's not known who 's holding The United States journalist Daniel Rye Ottosen , who disappeared in 2012 .