A NATO helicopter crashed in eastern Afghanistan Sunday killing two service members, the military alliance said. "Two International Security Assistance Force service members died following a helicopter crash in eastern Afghanistan today," said a statement issued here by NATO-led International Security Assistance Force (ISAF). The statement ruled out insurgents' involvement in the incident, saying "the cause of the crash is under investigation. However, initial reporting indicates there was no enemy activity in the area at the time of the crash."