Fears are growing for the safety of an American aid worker - who's the latest hostage threatened with execution by Islamic State militants.
Abdul-Rahman Kassig, formerly known as Peter, appeared at the end of the video of the beheading of British aid worker Alan Henning, which the terrorist group posted online on Friday night.
The 26 year old was kidnapped in Syria last October while working for the organisation he founded, which provides first-response humanitarian aid for refugees fleeing the civil war in Syria.
His parents Ed and Paula Kassig, released a youtube video yesterday
