Authorities looking into why jet went down during takeoff from Kandahar airfield . Crew ejected safely ; involvement of insurgents has been ruled out of cause of crash . Military officials did not identify type of jet that crashed , nor the nationality of the pilot . It did not announce the cause of any of the crashes . Crash is the fourth plane wreck in three days .
Authorities looking into why jet went down during takeoff from Kandahar airfield . Crew ejected safely ; involvement of insurgents has been ruled out of cause of crash . Military officials did not identify type of jet that crashed , nor the nationality of the pilot . Crash is the fourth plane wreck in three days .