Air show to the northwest, small metallic objects forming circle formations to the southeast 4th appeared out of nowhere.I was on Bernal Hill south of market area SF. I was watching an air show from this vantage point looking north towards the Golden gate bridge. All of the jets were flying between the Golden Gate & Bay Bridges these jets were several miles north/west of my location. I was waiting watching when a glint caught my eye. I watch as three miniscule points drifted east at about 10 to 15,000 feet? Nothing strange about that...Then the three started to circle and formed a separated triangle shape. At first I thought maybe they were birds circling but it seemed really high... but when they rotated the sun glinted off of a metallic surface, which caused them to glitter. They were very very small and hard to track against the blue sky. Suddenly out of nowhere a fourth appeared and they started heading east in a straight line one right after the other away from the city. This all happened directly above the South Of market area of San Francisco between Potrero hill and Bernal hill. Meanwhile the jets were twisting and twirling over downtown and the Embarcadero. One of the tiny metallic objects stayed behind for several minutes circling while the others headed east. Then after about a minute took of after the others and headed over the hill and I lost site of it as I was standing on the west side of Bernal Hill.((NUFORC Note: Witness elects to remain totally anonymous. PD))