Two British troops killed in Afghanistan: timeline of 'green on blue' killings January 31: Nato says one of its force members has been killed by a man wearing an Afghan army uniform in the south of the country. February 20: An Albanian member of the Nato force is killed and one of his compatriots injured by an Afghan police officer in southern Afghanistan. February 23: Two US soldiers are shot dead by an Afghan soldier during a demonstration in the eastern province of Nangarhar. February 25: Two US military advisers are killed in their office at the interior ministry in Kabul. The attacker, a member of the police, flees. March 1: Two US soldiers serving with the Nato force in the south are killed by an Afghan soldier and a local civilian. March 26: Two British soldiers are killed by an Afghan wearing an army uniform in the southern province of Helmand.