8 Bizarre regular explosions going off on the roof of the FBI building in downtown Washington DC - 2:30am, 12th October - no reports, no official explanation? (youtu.be) posted 2 years ago by clemaneuverers 2 years ago by clemaneuverers +10 / -2 2 comments share 2 comments share save hide report block hide replies
Boiler pressure relief valve , but they are usually more sustained and not BOOM like this one... You can see it's steam on the roof venting out horizonally from the roof top boiler room (That should be a boiler room there)