Intense white lights followed by red and blue lightsI was sitting at my computer with the window open when I noticed what I thought was a blue helicopter light, but it quickly grabbed my complete attention with its strange movements. The light moved across the skyline at extremely high speed, assuming the object was as distant as I think it was. It was also incredibly smooth, gliding effortlessly north to south. Every 8 seconds or so, the radiant blue light became an intense white light for about 1 second, and then became a dull red before becoming an intense blue again. This happened probably 4 times before the object dipped below the some apartments to the east of me. I've never seen something that I couldn't explain like this before and thought I should describe it. My girlfriend also witnessed this UFO and agrees that it could not have been any aircraft the two of us are familiar with. I couldn't really see a craft shape very well, but she feels that when it went from the white light, which was VERY bright like search lights, back to red and then blue, it kind of seemed like the object was rotating. We opened our back door I couldn't hear any damn thing, but my girlfriend thinks she heard it whining, again unlike any aircraft we understand.