cnn's gary tuckman has all the details. >> reporter: for those who support arming school teachers, jesse davidson would not be the role model they're looking for. the 53-year-old social studies teacher at dalton high school in north georgia locked himself in his otherwise empty classroom and then is accused of shooting his handgun. >> this is the classroom where the teacher was at. and this is the window where he fired his gun. and it's now boarded up. >> reporter: the school principal said he went to the classroom twice after he heard he was not coming out. >> he told me he had a gun. shortly after that i heard a gunshot. >> reporter: nobody was hit by the single gunshot, but panicked ensued. the school went into lockdown. if police know the motive of the shooting, they're not saying. >> i was shaking is and crying and hold anything best friend's hands and strangers's hands. we were just communicating with everybody, trying to see what happened. >> all you hear is the footsteps. we didn't know who it was in the hall way. we were scared every time we heard footsteps. we didn't know who w

so we sent gary tuckman to check it out. he did. here's what he found. >> reporter: when the mayor read the president's tweet claiming a fence in her community was the start of a southern border wall. she wasn't happy about it. >> we all as a community want to make sure the people out there in this country know california is not the beginning of a wall project for the trump administration. it is completely different. >> reporter: the director of international affairs for the neighboring city of mexicali wasn't as diplomatic. >> we knew it was a lie. >> reporter: the picture were taken here, we are standing in imperial county, california, in the city of calexico, on the other side of this fence, mexicali, mexico. the fence here is new. but it's a long awaited replacement fence. you can't get very close to the construction on the security conscious american side. but on the mexican side, you can get right next to it. close enough to talk to the american workers. i wanted to ask you a quick question. have you been told this is the star