UPDATE: A U.S. official has identified the senior officer killed in Afghanistan Tuesday as Maj. Gen. Harold Greene, the highest-ranking American officer killed in combat since 1970.

Greene was the deputy commanding general, Combined Security Transition Command-Afghanistan. An engineer by training, Greene was involved in preparing Afghan forces for the time when U.S.-coalition troops leave at the end of this year.

Greene was killed Tuesday in one of the bloodiest insider attacks of the long Afghanistan war when a gunman dressed as an Afghan soldier turned on allied troops, wounding about 15 U.S. and coalition forces. They included a German general and two Afghan generals.

An American general was killed today and 15 other soldiers wounded in an attack on a military academy in Afghanistan today.

The incident happened at an officers academy at Camp Qargha in Kabul when a gunman wearing an Afghan army uniform apparently turned his weapon against Americans and other Afghans, ABC News has learned.

A U.S. official described the shooting victim as a two star general.

Afghan President Hamid Karzai condemned the attack and described the death as a 'foreign officer.'

The Pentagon confirmed to ABC News today that in addition to one fatality, 15 International Security Assistance Force personnel were injured. Karzai said that both Afghan and foreign soldiers were hurt.

The soldiers were visiting the military academy to help with the buildup of Afghan security forces, Karzai said. He blamed the attack on 'enemies who don't want to see Afghanistan have strong institutions.'

'We are in the process of assessing the situation,' the ISAF Joint Command said in a statement. 'More information will be released as we sort out the facts.'

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