On April 27, 2015 around 12:00pm I was in the back of my office building taking a lunch break when I observed three light coming from the north. At first it looked like an airplane because the lights were all side by side coming straight at me at around 10,000 feet. The lights then banked to my left staying in formation flying in long circles a few times. Then the lights seperated and started flying all around each other. The lights were getting closer while they were doing there ariel manuevers. When they were directly over my head I could see that they were fairly large 30-60 feet in width. The lights stayed above me doing these remarkable manuevers. All of a sudden two more lights flying above those light north to south were flying at a remarkable speed, atleast 1000mph or more. When that happen the two of the three lights I was observing got into a formation and continued south toward the other two lights at a moderate speed. Now there is only one light left and it was continuing to do circles and ariel acabatics. Then all of a sudden it took off after the other two lights and caught up and went into a formation. How did I feel about it? It was an amazing experiance. The way they were moving around and manuevering these craft was an amazing site to see. I was extemely impressed by them. Was not affraid at all. I have witnessed alot of other objects in the sky before that I couldnt identify. But this was one of the most amazing experiances I have witnessed.