In this undated file photo provided by his family, Peter Kassig stands in front of a truck filled with supplies for Syrian refugees. © Courtesy Kassig Family, File/AP Photo In this undated file photo provided by his family, Peter Kassig stands in front of a truck filled with supplies for Syrian refugees.
The Islamic State jihadist group on Sunday claimed to have executed US aid worker Peter Kassig as a warning to the United States.
The extremist group released a video showing a masked militant claiming to have beheaded Kassig and standing over a severed head.