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Onawah had the best idea: tell the police. Report it as suspicious activity and let them check it out. Let your tax dollars do its thing and take the risk for you!

It all sounds very unsettling. If I were you, I wouldn't approach them alone. Perhaps bring your ex-military co-worker along if he's on hand. When you say "hundreds of people in that building", do...

Pretty interesting. What were the weather conditions? Was it dry/clear, the stars visible, or was it cloudy/misty/raining? Is there a lot of light pollution in the area, or tall buildings impacting...