Three light blue/green objects, diamond shaped, triangle pattern over the Andes in Peru, move extremely fast. 5 witnesses

Back in 1988 on the Andes in Peru at approximately 10 pm we observed 3 diamond shaped objects above a mountain very far away from our location, however they seemed pretty large considering the distance where the mountain was.  The objects were light blue/green and formed a triangle pattern.  
My friend’s father had a telescope and I closed on one of them.  I saw a large diamond with the color mentioned before, but it had bright lights in the middle.  All 5 witnesses were able to see the same thing in the telescope before the objects moved extremely fast on a horizontal and vertical mode to then disappear instantly at speeds that I had never seen before.  
It lasted for around 2 minutes.  
I’ve talked about this, only three times in my life.  This is the fourth.
Witness indicates that the date of the sighting is approximate.  PD