to see just the crush of humanity at the gates, and exactly what general mackenzie said, there's no way to do this without human contact. so what is the threat assessment for future attacks? >> they are still, the u.s. military is still very concerned about attacks. general mackenzie specifically said they expect more attacks and more attempts at attacks. that's opened up a new line of questioning here and that is who is providing security outside the airport. i think a lot of viewers would be surprised to know it is actually the taliban. the taliban set up a large perimeter around the airport. they are completely surrounding it with check points. general mackenzie spoke about that yesterday, they're checking people as they come through, but talked about varying levels of competence among taliban fighters. what's not clear is was this just an oversight that explosives and guns were able to get through check points or was