Washington Post reporting it as fire from USAF A-10's.
http://www.washingtonpost.com/wp-dyn...090400126.html
...The "friendly fire" incident happened after ground troops battling Taliban militants requested air support, NATO said.
NATO said the International Security Assistance Force provided the support but "regrettably engaged friendly forces during a strafing run, using cannons." It later identified the planes as U.S. A-10 Thunderbolts.
American military spokesman Sgt. Chris Miller confirmed that U.S. planes were involved and said the NATO force can request air support from the U.S.-led coalition.
One Canadian soldier was killed, and five soldiers were wounded and evacuated out of Afghanistan for medical treatment, said NATO spokesman Maj. Scott Lundy. An investigation has been launched...