KABUL , Afghanistan ( CNN ) -- A fighter jet crashed in southern Afghanistan on Monday , in the fourth wreck in three days , authorities said . A French Air Force Mirage 2000 sits under a shelter on the tarmac at an airbase in Kandahar on January 1 , 2009 . Authorities were looking into why the plane went down during takeoff from Kandahar airfield Monday morning , but the role of insurgents had been ruled out , said Lt. Col. Paul Kolken , the spokesman at the airfield . The crew ejected safely , and was being treated , Kolken said . Five hours after the crash , the wreckage of the plane was still on fire . Military officials did not identify the type of jet that crashed , nor did they release the nationality of the crew . Weather conditions were fair at the time of the incident , Kolken said . On Saturday , a U.S. fighter jet crashed in eastern Afghanistan , killing its crew of two . In addition , a civilian helicopter went down on takeoff from Kandahar airfield on Sunday , killing 16 people , NATO said . Watch details of the helicopter crash » . And a military helicopter made a hard landing elsewhere on Sunday , apparently injuring at least some of those on board , NATO said . None of the aircraft were shot down , said the International Security Assistance Force -- NATO 's mission in Afghanistan . It did not announce the cause of any of the crashes . There were at least two earlier crashes this month . Watch report on UK deaths in Afghanistan » . At least five people were killed when a helicopter went down in southern Afghanistan 's Helmand province Tuesday , a local government official said . And on July 6 , two Canadian air crew members and a British soldier were killed when a helicopter crashed during takeoff in Zabul province , the Canadian and British defense ministries said . CNN 's Ivan Watson contributed to this report .
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 .