Paula and Ed Kassig
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Islamic State Kassig murder: Parents pay tribute to son

The parents of a US medic beheaded by Islamic State (IS) militants have paid tribute to their son, saying they will learn in time to forgive his captors.

Mr Kassig, 26, is the fifth Western hostage to be killed by IS.

It comes as intelligence officials try to identify militants seen in a video showing his beheading.

Frank Gardner reports.

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