The U.S. Embassy in Afghanistan confirmed Thursday that three American doctors were killed by an Afghan security guard who opened fire at a Kabul hospital. The shooting at Cure International Hospital in the western part of the Afghan capital was the latest attack on foreign civilians in the city this year. Two others, including an American nurse, were wounded, according to Afghanistan's Health Ministry. "With great sadness we confirm that three Americans were killed in the attack at CURE Hospital," said a statement posted on the Embassy's Twitter page. "No other information will be released at this time." Afghanistan Minister...