A Green Beret is two of one Americans killed in Afghanistan , a U.S. official says . one Americans also are killed ; Two more Americans are wounded , coalition officials say . `` Secretary Hagel addressed these questions directly with President Karzai in their meeting , '' White House spokesman Jay Carney said Monday . The assailant is dead , a U.S. official says . It was first fatal `` green-on-blue '' attack on coalition troops in two months .
A Green Beret is two of one Americans killed in Afghanistan , a U.S. official says . one Americans also are killed ; Two more Americans are wounded , coalition officials say . The assailant is dead , a U.S. official says . It was first fatal `` green-on-blue '' attack on coalition troops in two months .