Black triangular UFO over Lisbon, in Portugal

On October 18, 2016, a black triangular-shaped UFO has been caught over Lisbon, the capital of Portugal. The witness has sent his image to MUFON website.

Witness statement:

With a beautiful sunset I test my htc one m8 to compare with the Olympus sz31 mr (the clock of this one wasn't right). I took photos changing cameras about in 5'', and went to the pc and noticed the screen was dirty. But not. I was wrong. It was not dirt, and when I zoom in on photos, I noticed photographed a Northrop Grumman B-2 Spirit ... or a UFO?
So I send the photos to your analysis because you are the experts on these subjects and because I'm curious. I do not think a Northrop Grumman B-2 Spirit fly the skies of Portugal...but not impossible!
Is it possible to give me answer?