1 - Niles, IL - Watching fireworks from the 3rd floor of a parking garage. 2 - It's 2 bright green lights and the blinking white light as it hovered over the fireworks. And at random the green lights changed to red and eventually back to green. 3 - My friend and I actually discussed the potential of it being a UFO or a helicopter, but found the light display to be strange. 4 - It originally hovered over the fireworks for a couple of minutes, as if it was spectating he show. We were about 300 yards from the fireworks and elevated as we were sitting on the top of a parking garage. It then went from hovering and quickly darted east much faster than the local planes flying through the skies. It also randomly changed light between green and red with a constant white blinking light. It changed direction incredibly quickly and eventually disappeared extremely fast into a tree line. We watched it descend and lost sight in he matter of seconds. 5 - Once the object began to change color and fly, we began to take the event seriously, and were almost excited. After the sighting we could not stop watching the 29 second video that I caught and tried to debunk the activity, with no success. I followed up to do some research on whether anybody else In the area reported sightings. It simply did not make sense in regards to its speed, light display, how it hovered and accelerated, the lack of noise, and how it descended and disappeared. 5 - Looked to descend in a tree line potentially 5 miles away and the lights dissipated as it disappeared.