Bright orange lights in a formation, some seperation movement, then vanish in SC.I was standing outside my front door having a cigarette and just happened to look towards the lower sky in front of me. I see 4 or 5 orange glowing lights almost in a circle/oval type shape, they didn't move at first, then it appeared at least two of them started moving into the center of the formation after a min or so and then all of the lights vanished at the same time. The lights were brighter than stars and all of them glowed orange in color. After they vanished i heard faint rumbling sounds like thunder for about 30 seconds in the sky. This was not very high in the sky either....from my view point the lights were maybe 300-500 feet in the air. I noticed flashing lights from aircraft shorty afterwards flying around and through the area.