Six Spheres of light move into my vision over the 92 Albuquerque Balloon Fiesta,then vanish straight up.

We had just moved to Albuquerque and were attending the 1992 Balloon Fiesta. I had been photographing balloons all morning. At 10:00 the Fiesta was winding down; only a few balloons were still aloft. Then it happened,two spheres of light about the size of 5 magnitude stars, moving from east to west moved into my line of vision & stopped directly over head. Two more followed,then two more. They too stopped & remained motionless for a short period. Then all 6 began maneuvering independently in straight lines with no given pattern,right,left,backward,forward. It was all happening directly overhead,well above balloon altitude. I took 6 photos using a 35-105 zoom lens,5 of the photos included balloons for scale reference. The 6th without balloons. All 6 spheres reduced in size,as if going straight up until they vanished.