Islamic State hostage's parents despair at being 'powerless' to help
US pair break silence, voice despair at plight of son taken by Islamic State

The desperate parents of a US aid worker threatened with beheading by Islamic State militants last night said they had tried to save him, but added "we don't have the power to do it".
Paula and Ed Kassig said they had decided to break their silence about their son's yearlong captivity because "the dynamics have changed" and they fear for his life.
They said they've been doing all they can to free 26-year-old Abdul-Rahman Kassig since he was captured in Syria more than a year ago.
That includes appealing directly to his captors via YouTube and Twitter messages.
A militant threatened Kassig's beheading in an October 3 video, in retaliation for US bombing attacks. The couple told CBS This Morning that the militants had issued demands that are beyond their power to meet.
"They demand. They simply demand," Ed Kassig said.