IS video suspect's sister: 'Voice resembles his'

Intelligence agencies are examining the possibility that a man featured in a propaganda video by so-called Islamic State could be Siddhartha Dhar, a British jihadist arrested in 2014, who later jumped bail.

The video features a man and young boy with British accents and purportedly shows the killing of five men who IS says were spying for the UK.

Siddhartha Dhar's sister, Konika Dhar, has told the BBC that she is not entirely convinced it is him.

Chief correspondent Gavin Hewitt reports.