File photo shows American ISAF soliders patrolling a village in Khost district. A suicide bomber tore through an Afghan-NATO foot patrol in a crowded city, killing at least 20 people, including three ... more 

File photo shows American ISAF soliders patrolling a village in Khost district. A suicide bomber tore through an Afghan-NATO foot patrol in a crowded city, killing at least 20 people, including three foreign troops and their interpreter, officials said less