Here's the full witness account, submitted to MUFON:
Last night (sept.1st) at around 9pm MST, myself, my mother and two friends observed 4 red orbs coming from the south. They were at airplane level, but were very unsteady in their flight. These orbs showed one at a time, after one orb headed west and lights shut off, the outline of the object was still slightly visible. Then it disappeared. Then another would appear to ascend from the south and do the same thing in a slightly different travel pattern, still pulsating and dimming and changing in direction. As if it was "wiggling" it's way across the sky. They weren't flares nor were they any sort of firework. There was also no accompaning sounds or sounds as they dissapeared.
Did you see these weird lights, too? If so, report your sighting!