Strange UFO over a farm in Philadelphia, New Jersey

On April 25, 2015, a woman was in a farm in Philadelphia, New Jersey. She took a photo of a horse. Later, her boyfriend has noticed a mysterious object on picture.

Witness report:

My girlfriend took this photo of the horse farm .. She attempted to zoom in on the horse statue that only has 3 legs .. And noticed this dark triangle close to the farm. So she sent me the pic.. And asked me what I thought me.. So I submit these photos to the pros for scrutiny and investigation .. Side note .. She said the giant cloud above the farm was circle shaped and still.