of naval employees work. that's where some intelligence activity happens and just other sort of functions of the u.s. navy. this is not the pentagon. this is the navy yard which is a sprawling facility in the southeastç corner of washington. but you're right, those memories of that 2013 shooting with that contractor who was able to enter the building there and we have no idea if it's a similar situation or not. several things have changed since that happened of course in twirtd. 2013. the workers we've been able to speak to so far hearsay they're certainly on edge with that so fresh in their mind. but again we are not sure if it's a similar situation. police quite frankly aren't saying. they're trying to determine exactly what is going on the anything inside. >> looking at the scene outside, we can see swarms of police officers, some look like they're in some form of riot gear.