Okay, I am feeling the apartment trembling. It trembled about four times in the last few minutes with the accompanying low, rumbling noise. I thought I might be getting paranoid, but my roommate heard it, too - he thinks it might be a plane. But I've been hearing planes fly over our heads all day long and didn't feel the apartment shake. Anyways, the news aren't updating us about it so who knows.
I don't believe we are still awake; it's already past 1:30 AM. I must definitely go and brush my teeth now and head to bed! Hoping for a quiet night with no sirens. (The shaking continues as I write!)