Three "fireballs" travelling in line and equidistant. First fireball stopped, turned around, receded to tiny white light.

Upon leaving the school at approximately 1900 hours we observed first a "fireball" traveling at a constant speed (ie, neither accelerating nor decelerating). It appeared to stop when two more fireballs appeared in a straight line and equidistant, behind the first. The first then "turned around" and receded into the distance appearing as a small pin-prick of white light. I cannot say what happened to the other two as we had to drive on. I estimate that we observed them for about 10 minutes.
They looked nothing like I have ever seen before in the sky and I am confident that they were not meteor showers, meteorites, drones, helicopters, planes, fireworks, Chinese lanterns, or any tricks of light. It was dusk and the sky was clear.