Submitted for your approval, one video from local resident vplus that shows a bright (and loud) explosion in the sky as shown from a front porch on 9th Street between I and K Streets NE (view is towards 10th Street NE). Vplus indicates that the explosion happened just before midnight on Wednesday (11:57:28 p.m. ET on 9/27/17). The explosion looks a lot like a blown transformer, but vplus says there isn't any electrical wiring or anything it in the approximate location of that explosion. I checked the satellite view on Google Maps and I also did not see anything like that.
Screenshot of the video
Obviously, it could be a very loud firework, but look at this screenshot I took. It seems very bright for a firework, but maybe that's just the Nest camera? What is this? Lightning striking something? Perhaps it's something further away. Did you hear the sound of an explosion just before midnight Wednesday?