In Afghanistan, two US soldiers were killed today by a man wearing an Afghan border police uniform in northern province of Faryab. NATO -led alliance said in a statement that the attacker fled the scene and NATO and Afghan authorities were investigating the shooting. It was not immediately clear if the shooter was an Afghan police officer who turned on his Western counterparts or a militant who donned a uniform to infiltrate the base.Attacks by Afghan police and soldiers have appeared to increase over the past 12 months as NATO and Afghan forces work more closely together.Today's shooting came as protests continued in the country over a Florida pastor's burning of the Quran, claiming at least 21 lives so far. The Quran burning appears to have inflamed a simmering anti-foreigner sentiment in the country, where anger about civilian casualties and the long-running conflict have worn down the support for Western forces.