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INDIANAPOLIS – The parents of a U.S. aid worker threatened with beheading by ISIS say they broke their silence about their son’s yearlong captivity because “the dynamics have changed” and they fear for his life.

Paula and Ed Kassig said during interviews broadcast Monday that 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.

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A militant threatened Kassig’s beheading in an Oct. 3 video, in retaliation for U.S. bombing attacks. The couple told “CBS This Morning” that the militants have issued demands that are beyond their power to meet.

“They demand. They simply demand,” Ed Kassig said.

“We have sent them back messages that we cannot do what you ask. We have tried. But we don’t have the power to do it,” his wife added. They did not say exactly what the militants demanded, beyond the mention of U.S. raids in the video.