Four red objects appear from bottom of smoke trail over Arizona high plateau region.My dad and I were driving along I-40 on the edge of the Navajo reservation nearing St. Joseph City when my dad alerted me to something he saw to the north of us. At first, I thought it was the smoke stacks that are part of the power plant located at St. Joseph City, but they were on the wrong side of the freeway. My dad, being ex military thought we were getting nuked. I tried to be rational about it and said maybe they put up a new smoke stack. When I slowed the car from the posted 75 mph not wanting to stop because I had a court date to attend in Chinle, I looked more closely. We both asked each other if we were seeing th same thing and we concurred. It was about this time the bottom of the smoke trail began to light up like something was entering the atmosphere. I compared it to the footage I saw of the shuttle burning up upon re-entry but on a grander scale. After the fire/sparks died down, 4 objects remained. They were red in color and were in a diamond formation. The smoke trail disappeared, but the four objects remained and no longer followed a free fall trajectory. They leveled off and continued their southernly route toward us appearing larger. When I was about to stop the car, three of them vanished. We both strained to keep the fourth in view but it appeared to turn eastward and it too disappeared. Even though we had court to attend, it continued to be our travel topic all the way to court and on the return trip to Las Vegas. I was a huge sceptic of UFO's,..... was. I wish I got a picture.