Western intelligence officials are trying to identify Islamic State (IS) militants seen in the video that shows the beheading of US aid worker Abdul-Rahman Kassig and 18 Syrian prisoners.

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

One of the militants is likely to be a Frenchman named Maxime Hauchard, 22, France's interior minister says.

Another was reported to be a Briton, but the father of Nasser Muthana, 20, now denies it is his son.

The Daily Mail had earlier reported Ahmed Muthana as saying "it looks like my son".

But Mr Muthana now says his son is not among the 16 jihadists in the video.

BBC