Boston is on lockdown today, which is terrifying to hear but even more terrifying to see. Business Insider has collected some photos from Twitter, taken by people who ought to go back inside. Seeing a major city as a ghost town is incredibly sobering.

Like so much this week, this feels like a movie, like it can’t possibly be real. Technically it is my job to make a joke here, but that’s not going to happen. Stay safe, everyone.