Three bright white lights with equally bright flashing red lightsSaw what I believed was an aircraft flying west to east from Dulles toward Washington, DC. It had three bright white lights, all spaced apart. Each light had an accompying bright red light, flashing. Whatever this was, it was flying very low. Honestly I couldn't tell if it was one aircraft with evenly spaced lights or several aircraft flying together. It was flying very low--possibly right above the tree line. A helicopter was flying the opposite direction and appeared to be much higher. The helicopter was very loud but whatever I saw, it made no noise that I could hear. It flew in silence at a very consistent pace. Not that fast but not slow either. There are many aircraft out tonight but the lights on the other aircraft are less bright and they tend to have white strobes. Whatever I saw did not, just very bright white lights with pulsing red lights. Both light were of equal brightness. Might not be an alien craft but it was very strange!((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))