Parents of Islamic State hostage intensify efforts

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Peter Kassig, Indiana aid worker threatened by ISIS
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Parents of Islamic State hostage intensify efforts
INDIANAPOLIS, IN - OCTOBER 8: Ed and Paula Kassig attend a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Attendees look on during a vigil for aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Ed and Paula Kassig attend a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Attendees look on during a vigil for aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Paula Kassig leaves a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Ed and Paula Kassig attend a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Paula Kassig attends a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Paula Kassig attends a vigil for their son, aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)
INDIANAPOLIS, IN - OCTOBER 8: Attendees look on during a vigil for aid worker Peter Kassig at Butler University October 8, 2014 in Indianapolis, Indiana. Kassig has been held by ISIS since being captured in Syria in October of 2013. (Photo by Aaron P. Bernstein/Getty Images)

Abdul-Rahman Kassig working as a medic to help a wounded man. A trained emergency medical technician, Kassig provided medical aid and first-aid training to those involved in the Syrian conflict in his work with Special Emergency Response and Assistance (SERA). Photo taken near Deir Ezzor in August 2013. (Photo provided to the Kassig family by the copyright owner with permission for media use.
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Abdul-Rahman Kassig (middle) helps push an ambulance up a hill during his time working with SERA. Photo taken near Deir Ezzor in August 2013. (Photo provided to the Kassig family by the copyright owner with permission for media use.
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Abdul-Rahman Kassig as a young boy with his mother, Paula Kassig, at Cumberland Falls State Resort Park near Corbin, Kentucky, during a family camping trip in 2000. (Photo provided by the Kassig family.
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Abdul-Rahman Kassig fishing with his father, Ed Kassig, near the Cannelton Dam on the Ohio River in southern Indiana in 2011. (Photo provided by the Kassig family.
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English transcript of today's video statement by the family of Abdul-Rahman Kassig, formerly known as Peter.

"As Muslims around the world, including our son Abdul-Rahman Kassig, celebrate Eid ul-Adha, the faith and sacrifice of Ibrahim, and the mercy of Allah, we appeal to those holding our son to show the same mercy and set him free."
RT @pdanahar: This is one of the images of Peter Kassig that his family has asked people to use to discuss his plight http://t.co/d1o5nOo7c6
Family of American ISIS hostage Peter Kassig: "We ask everyone around the world to pray" - http://t.co/2TFsB1rH3N http://t.co/pVZS9jjZTH
#ISIS now threatening American aid worker Peter Kassig w/death. Our thoughts & prayers to him & his family http://t.co/reoNImXXcY
Indiana native Peter Kassig threatened in latest ISIS beheading video: http://t.co/9ITmkOBJov http://t.co/CC3twfxX0K
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INDIANAPOLIS (AP) -- The parents of an Indiana aid worker threatened with beheading by the Islamic State group 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.

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.

Abdul-Rahman Kassig, who was born Peter Kassig but changed his name following his conversation to Islam while in captivity, was providing medical training and humanitarian aid to victims of the Syrian conflict when he was detained on Oct. 1, 2013.

His parents said they were silent about his plight for a year at the instructions of the Islamic State militants but decided to go public after their son was named the terror group's next victim in a video that showed the execution of British hostage Alan Henning.

The video was the fourth released by the group. Previous victims were U.S. reporter James Foley, American-Israeli journalist Steven Sotloff and British aid worker David Haines.

"The dynamics have changed now. Steven's family kept to secrecy, and he was executed. Peter's name has been listed," Ed Kassig said.

Paula Kassig told NBC's "Today" show that the couple received an audio recording of their son a couple of weeks ago in which he said he feared his time was running out.

The couple on Monday also released additional excerpts from a letter written by their son and delivered by a former hostage.

In it, he said he was underweight but had no physical injuries and was "holding his own" but feared his time was short.

"I hope that this all has a happy ending but it may very well be coming down to the wire here," he wrote.

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