White UFO snapped near Vatican, Rome

On May 9, 2015, a person was in Rome, in Italy. On St. Peter's Square, he has taken a photo of the famous Egyptian obelisk. Later by looking pictures, he noticed a white shape in the sky. What is it?

Witness statement:

We were at the Vatican taking photos and later that day when looking through them i noticed a bright white dot in the sky.

The photo was taken with my Samsung Galaxy s5 and when zoomed in 2 more white objects became visible but appeared much smaller/more distant. The main object looks like a solid white ball with a cloud around it with a couple small black dots.