atl least 17 people are dead tonight. 13 killed inside the school, four killed outside. and david, multiple people are in surgery. david? >> we are thinking of them. and victor, while we're looking at the pictures behind us, just describe for us the scene. we know the fbi is on the scene, local law enforcement on the scene. as the reunions take place, there were the images of the backpacks simply left out in the street, just beside the school. >> reporter: david, this is a massive school, so, as you can imagine, the police presence here, the amount of law enforcement that showed up, it was an impressive show of force here. it is just a mess here, to be honest with you right now, but investigators will be working through the night to determine, give us an exact number, working through this horrible scene here tonight, david. >> victor oquendo leading us off. so sadly, seeing the students with their arms in the air, unfortunately, children know what to do across this country when gunfire breaks out. abc news has now learned at least 17 dead, just a short time ago, we heard