it's somebody who's trying to make it seem like he has an explosive or it's somebody who does have an explosive and is trained in improvised explosive devices, which is what this tank would seem like. either that or he's using some type of oxygen respirator in order to breathe oxygen in the event the building is burned down -- >> aaron, let me interrupt you for a second. let's go to a press conference. >> right now, it's still very fluid. >> what about employees in the building? i've talked to some employees who were told to take cover, to lock themselves into offices and then they were told they could leave the building. do you have most of the employees out or are there still some employees in there? >> i don't know about how many employees are still there and how many have been out of the building. >> does this man have hostages? >> i don't know that. >> is he still in the lobby of the building? >> we're speaking with him now. he's in the building. >> is he in a known place to you?