In a special edition of Guardian Daily devoted to events in Afghanistan we ask how significant were the killings of five British servicemen by an Afghan policeman in Helmand this week? What impact will the UN withdrawal from Kabul have on the Nato operation? And what effect will a troop surge - or a phased withdrawal - have on Afghanistan?Jon Boone reports from Kabul on the hunt for the policeman who carried out the gun attack.Peter Beaumont, foreign affairs editor of the Observer, says the killings will have an impact on British public opinion, which continues to ebb away from supporting a UK military campaign.Rachel Reid, Afghanistan specialist for Human Rights Watch, says a civil society can be achieved in ...