Strange WTC Mists

A friend and I visited NYC for the first time in late August, 2001. While at the top of the World Trade Center, we took pictures from the windows. When I received my pictures, I scanned them and sent for copies for my friend. We did not notice the strange mists on the pictures until they were scanned. This mist shows up on the original picture also. It gave both of us an eerie feeling to see what seems to be two figures floating in the skies over NYC from the World Trade Centers, especially since September 11.