Was Reyaad Khan killed because of a threat to Britain or to Iraq?

Was the drone strike that killed Reyaad Khan authorised because he posed a threat to Britain, or because he posed a threat to Iraq? Last week, David Cameron told the House of Commons that the strike took place because ‘there was a terrorist directing murder on our streets and no other means to stop him’. His statement to MPs, and the briefing that lobby journalists received, was about the threat that Khan posed to British citizens. Cameron said:

‘With these issues of national security and with current prosecutions ongoing, the House will appreciate that there are limits on the details I can provide. However, let me set out for the House the legal basis for the action we took, the processes we followed and the implications of this action for our wider strategy in countering the threat from ISIL. First, I am clear that the action we took was entirely lawful.