ROUGH CUT - NO REPORTER NARRATION<br/> <br />Security in the Afghan capital Kabul was tight on Sunday (December 28) ahead of a ceremony set to mark the end of NATO combat missions in the country.<br/> <br />The ceremony will formally draw to a close 13 years of combat operations in the conflict in the country, which have left the country in the grip of worsening insurgent violence.<br/> <br />Police armed with automatic weapons were seen searching vehicles and individuals on the streets, a day after Afghanistan's NATO-led foreign force mistakenly killed three civilians in an air strike, Afghan officials said on Saturday (December 27).<br/> <br />The mistaken killing of civilians in air strikes has been a source of anger throughout the force's mission, frequently straining ties between the NATO force and the government.<br/> <br />The latest incident took place in Logar province just south of the capital, Kabul, on Friday (December 26), and it involved nomads who had clashed in a dispute over land, provincial o
