KABUL - One NATO soldier was killed and two injured in a roadside bomb blast in eastern Afghanistan, the military said Sunday. The soldiers, who were part of International Security Assistance Force (ISAF), were attacked during a patrol on Sunday, the alliance said in a statement.The statement did not disclose the nationalities of the soldiers, nor did it say where exactly in the eastern region the incident took place. Most of the soldiers serving under the banner of ISAF forces in eastern provinces are from the United States.