At first the killing of Paul Johnson in Saudi Arabia looked like the straightforward terrorist act that was reported. But then doubts and (in the words of the Independent article) "troubling questions" have emerged. See:
http://news.independent.co.uk/world/middle_east/story.jsp?story=533519 and
http://news.bbc.co.uk/2/hi/middle_east/3826423.stm.