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(CNN) – The masked killer in the video showing the beheading of British aid worker David Haines appears to be the same man in the murder videos of American journalists James Foley and Steven Sotloff.
In all three, he makes vile threats to the camera with a British accent.
Now, British officials tell CNN that Prime Minister David Cameron has been told this man's identity, but they are not releasing his name.
"They're probably drawing still on a number of intelligence assets around the suspect to try and determine his whereabouts. And much like many of these types of operations, the key thing will be to ideally locate and also recover the individual, and confirm this, before actually revealing their identity," said counterterrorism expert Will Geddes, CEO of International Corporate Protection.
The Brits "will be somewhat guarded, and they probably will be until they have that further evidence," he said.
For more of our interview with counterterrorism expert Will Geddes, check out the video above.