Is Afghanistan governable? As Hamid Karzai begins a new term as the Afghan president, why should the U.S. trust him? Christiane Amanpour gets answers on "Amanpour," Sunday at 2 p.m. ET.
Kabul, Afghanistan (CNN) -- Two U.S. service members were killed in southern Afghanistan on Thursday, NATO's International Security Assistance Force confirmed.
A roadside bomb in Zabul province killed the troops, ISAF said.