The U.S. Embassy in Afghanistan confirmed Thursday that three American doctors -- including a father and son -- were killed by an Afghan security guard who opened fire at a Kabul hospital.
"With great sadness we confirm that three Americans were killed in the attack at CURE Hospital," said a statementposted on the Embassy's Twitter page. "No other information will be released at this time."
The shooting was the latest in a string of deadly attacks on foreign civilians in the Afghan capital this year.