floor and checking every room. we have reports still coming in, shep, where there's nurses and doctors that are hunkered down behind rooms. so in this type of sen naish -- scenario, it's difficult to clean this type of a building, even if they have who they believe the suspect is in custody. you still have to go through the entire checklist to make sure there's nobody else that can cause harm. then you throw in one more mix in the recipe, which is the patience safety. you have to make sure the patients are all in their rooms, they are all safe. that's another layer of intricacies when you talk about doing these types of searches for potential harmful people. shep? >> on matters like this, the numbers change a lot. we just got word on what we believe to be a fourth casualty. new york city police and fire say casualty, they mean someone