Bright purple UFO over Niagara Falls, USA

On August 11, 2014, a person was in Niagara Falls (State of New York, USA) when he has noticed an unusual light in the sky. Witness has taken a photo of phenomenon. What is it?

Witness statement:

I was in Niagara Falls New York looking at the falls and the lighted buildings on Canada side. I first noticed it as a dull light in the sky; I assumed it was a building reflecting light. It was a purple light with a purple haze around it and a light being projected from the top. My reaction was confusion because it was no longer there. I lost sight when I looked at my friends to point it out to them and when I looked back it was gone.