At 11:15pm on April 17, 2009, four bright objects were sighted flying at a very high speed, in a strange pattern, over N. VaAfter leaving dinner with several friends in Falls Church, Virginia, my husband and I walked out to our car. It was about 11:15pm on April 17, 2009. The sky was very clear with no moon, so I looked up to see some stars. I looked directly overhead, which at that time and season was toward the area of the sky around the fixed star Arcturus in the constellation Bootes.When I looked at the sky, I saw four luminous, round objects moving in a northeastern direction. The objects were uniform in size their brightness was similar to an average star. They were clearly flying at a very high altitude. Thinking at first glance that they were a group of meteorites, I pointed them out to my husband. It became apparent that they were not meteorites since their shape, speed and luminosity was constant. They flew almost directly overhead at a high speed and altitude, and did not appear to be birds.As the objects continued to fly toward the northeast, their formation changed. Rather than flying at a constant direction and speed, they began a movement pattern that was similar to a small swarm of insects. They maneuvered around each other, almost playfully, staying in one group.The objects seemed to move in a more northerly direction as they assumed this new flight pattern and then flew to the north toward Washington, DC and out of sight.