I am glad they know who it is. I would not take him prisoner.
“John” - was this a person of British heritage, who converted to Islam (either from being a former Christian, or of no religious denomination), or was he the child of Islamic immigrants, or was he an immigrant to Great Britain himself?
If the first instance, we are in vastly more trouble than we now know. In the second instance, a wholesale return of these immigrants from the far reaches of the old British Empire/Commonwealth is fully justified. If an immigrant himself, and “naturalized”, strip the citizenship immediately.
In every instance, he is a primary target for capture or elimination.
Maybe a drone can find this John?