UFO with blue lights snapped in Steuben

On June 19, 2015, a father and his wife were outside in Steuben (city located in Washington County, Maine). Suddenly, a black object with blue lights is appeared. What is it?

Witness report:

My dad was outside with his wife and they saw a light when they turned to look they saw a large craft hovering. It made no noise. It had stationary blue lights on top and pulsating white lights around the bottom. Suddenly, still without making a sound it zipped to the right, zipped back to the left and that flew away at a crazy speed. My father said he felt it was a craft from the start. While I have believed in UFOS since childhood I have always known my dad to be a skeptic, now he stands outside every night looking for another one.