PLO and other rebel groups control most of the refugee camp , activists say . `` Never has the hour been more desperate '' in the camp , U.N. says . `` `` Reports of kidnappings , beheadings and mass killings , '' ISIS official says .
ISIS and other rebel groups control most of the refugee camp , activists say . `` Never has the hour been more desperate '' in the camp , U.N. says . `` `` Reports of kidnappings , beheadings and mass killings , '' PLO official says .