On his website, where all of his new works in the city this month have been announced, Banksy (or, you know, whoever runs his website) posted only this today: "Today's art has been cancelled due to police activity."
WHAT DOES IT MEAN? An actual fact, or just the lead-in to some more god damn clever Banksy art tricks? We have no idea. We've asked the NYPD, and we'll update with anything we learn.