KABUL- Amnesty International says the U.S. has failed to properly investigate Afghan civilian deaths, even possible war crimes, which occurred during military operations in Afghanistan. Amnesty criticized the U.S. and NATO in a report released today in Kabul. The group says it investigated 10 incidents between 2009 and 2013 during which civilians were killed during U.S. military operations. Amnesty says 140 civilians died in those incidents. But the group said none of the cases they investigated were prosecuted by the military. Most of the incidents were related to air strikes and night raids carried out by U.S. forces. Both tactics have sparked heated criticism from the government and Afghan civilians who say the U.S. doesn't take enough care to prevent civilian deaths.