So were they FBI, jerks/thugs from Homeland Security or private ex military?
I would imagine MAYBE that these two men are a WMD survey team. Many large sporting events, Rose Parade, etc have WMD survey teams with monitoring equipment on there person looking for any chemical/radiation release. My brother-in law used to do this...the equipment is so sensitive it can detect people that have cancer and have received radiation for treatment.
Those two are definitely suspiciously looking for somebody or something. Have they been identified??? and if not why not???