UFO Sighting in Las Vegas, Nevada on 2017-10-29 14:15:00 – Saw object in sky and took 2 pictures- then it took off as we got closer

We were driving and my husband said look at that, what is it? i observed a rectangle shaped object hovering very close to us...It was quite large. as we tried to move closer we took 2 pictures and then all of a sudden it seemed to change shape somewhat and then it was miles away from us. it looked very small at this point. we tried to follow it but it just disappeared from our sight.