A Green Beret is one of two Americans killed in Afghanistan , a U.S. official says . The other was Staff Sgt. 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 one of two Americans killed in Afghanistan , a U.S. official says . Two Afghans also are killed ; 10 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 .