you have are the police going in. they will go to the immediate rorlgts of where this incident took place. that will be their first target. then they will fan out there, going building from building. they ll take anybody in any particular building, any particular room, take them out, check them with i.d.s. they have this picture of the person of interest. they ll check that picture and letting people go and leading them away, what they can to be a safe area. as i said, building by building. this is a long, long process obviously. until they are absolutely certain that there is no longer any threat remember, they may have the person that they believe is the suspect in custody. they do not know if that person, for instance, may have left any devices behind, any explosive devices. any ammunition, any other weapons that could be there. they want to make sure that