Cloudmaking UFO over Manhattan

I could see the blood red skies from inside my living room. I went onto the balcony with camera in hand to capture the exceptional sunset. All of a sudden, out of the dark clouds above the red was a large moving cloud. As it gathered speed, the cloud covering it came off revealing some kind of craft. My first UFO! Within seconds, as if it realized it had lost it's cover it beat a retreat back into the dark cloud. I have uploaded some other photos from this sequence showing what I am referring to. This picture has not had anything added or removed from it in terms of subject. I may have had the camera on the 'warm setting - I don't recall.