Two sets of 3 red lights (arranged like a triangle) apparently belonging to 2 objects. They came close together then flew away in different direntions.

I was about 13-14 years old and on the porch of my house. At that time in my life I was interested in astronomy so I looked at the sky alot. On this particular night I was looking to the south over the top of a mountain range and to my surprise I saw 2 seperate sets of 3 red lights approach each other from the East and West. The objects came very close to each other but didn't appear to touch. I was able to get a relative to come outside just in time to see the objects seperate and fly away in different directions. One object flew back to the West while the other flew North over the house. At no time was I able to discern a shape of the crafts or even any engine noise. I would guess that the crafts were approximately a 3/4-1 mile up, as they didn't appear to be much higher that the mountains. I don't believe in alien spacecraft but I have no explanation for what I saw.