right now, we have a former nypd official. sal, thanks for taking the time. what you've been able to piece together from what we've reported, i'm told this is as close to a lock down that you can have inside and outside a hospital area. vehicles are stopped there. they're not going anywhere. that would continue until they want to confirm for sure there's not an additional shooter or that accomplice on site, right? >> another thing that they're concerned for, secondary devices that may have been planted. we sought that out in l.a. we have an active shooter come in and put the devices down so when law enforcement responds, harm comes to them. so you need to establish that perimeter. you need to be able to look for -- this was all part of the response protocols in place in new york now where we would go in and start looking for