afghan civilian, including nine children. this is that house to house rampage that happened yesterday. here is the latest. we have learned that the staff sergeant is in his 30s and was diagnosed with a traumatic brain injury after a vehicle roll over accident in 2010 in iraq. he was treated for that and then found fit for duty. he has served several tours in iraq. this was his first deployment to afghanistan. now, we also know he s a qualified infantry niper, which means he s trained to hit to kill at 800 meters. they say all evidence indicates he acted alone. he remains in nato custody and we have new details about how the u.s. military learned about the incident and what happened as soon as they found out. let s get to chris lawrence at the pentagon. what more can you tell us? one of the biggest tipoffs is when the the afghan villagers showed up at the base carrying their wounded saying someone had been shooting at them. now, before that happened, this soldier apparently