A video released onto the internet claims to show that Islamic State militants have killed the captured US aid worker Abdul-Rahman Kassig.

In the video, a masked militant stands over a severed head said to be that of Mr Kassig.

The aid worker - known as Peter Kassig before he converted to Islam - was kidnapped in Syria last year.

In October, an IS video of the killing of British aid worker Alan Henning had ended with a threat to Mr Kassig.


BBC/NS