their children. today our community faced horror and tragedy in what should have been a community celebration. carley: a holiday tradition turning into horror and chaos after a driver in an suv plowed into a wisconsin christmas parade, killing at least five people and hurting more than 40 others. what does emergency response look like for a mass casualty event like this? here to discuss, retired colonel andrew millburn. we know you have experience responding to mass casualty events overseas. with that in mind, what investigators are law enforcement doing right now to get to the bottom of this situation? >> yeah, carley, first of all, thanks very much for putting me on today. really appreciate it. and you know, for the benefit of your listeners, for your audience here, i'm not a medical expert but unfortunately all of us in the military have had to deal with mass casualty events,