Triangular silent object, 3 white, with a flashing red light in the middle.Slow, silent approach, just about 50-75 feet above the rooftops in the neighborhood, smooth trajectory, then as we stared at it,we could hear a quiet motor sound, it turned on its side, which looked like a triangle, and then suddenly disappeared. , either there was a second one or the same one circled back, briefly.((NUFORC Note: Source of the report provides no contact information. PD))