Combat Medic John Dawson, 22, Was Killed in Afghanistan Ambush

Sources said Afghan soldier who opened fire was a trusted member of the Afghan army for two years.
1:33 | 04/09/15

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Transcript for Combat Medic John Dawson, 22, Was Killed in Afghanistan Ambush
We have late developments on that attack on American soldiers in Afghanistan. That deadly ambush. An Afghan soldier opening fire on U.S. Forces. Late today, we learned the identity of the U.S. Soldier killed, 22-year-old John Dawson from Massachusetts, a combat medic. It was his first deployment overseas. And tonight, new images taken just one hour before that Afghan soldier turned on the Americans. ABC's chief global affairs correspondent Martha Raddatz with the images from inside that room. Reporter: These are images from just before the shooting. Afghan officials, U.S. Military and U.S. Diplomat don Yamamoto, meeting and sitting down for a meal together in the governor's Pala palace. It was after Yamamoto departed the palace when his military escorts were attacked, just outside the compound. An Afghan soldier firing a truck-mounted automatic weapon. U.s. Forces returning fire, killing the shooter, but not before 22-year-old John Dawson of Massachusetts was killed and seven others wounded. According to a source familiar with the shooting, the Afghan soldier had been a trusted member of the Afghan army for two years. And had clearance to get inside the compound. The source says, if that had happened, this could have been a blood bath. Could have been far worse, Martha, had he got into that room. Reporter: Certainly could have, David. They don't really know why he didn't go into the compound. Maybe he thought he had a chance to escape. But no chance of that in this situation. All right, Martha Raddatz here with us in New York again

This transcript has been automatically generated and may not be 100% accurate.

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