I worked a couple of blocks away from the World Trade Center in TriBeCa. I was on the PATH train under the Hudson river on my way to the WTC station that morning, as usual, when the conductor announced that the World Trade Center Station was closed - though we had no idea why. After being rerouted to 33rd street, I caught subways downtown and made it as far as Canal street. As I walked toward the office it quickly became obvious that my meeting was going to be cancelled, so I stopped and took some pictures: