Formation over Salt Lake City, UT

The report, as filed

We were at a concert at Red Butte Gardens in SLC. At about 8:45, my friend pointed out some lights in the sky. They were about 50. They were in a loose formation that resembled birds flying in a flock. They weren't blinking or flashing. However, they were dimming and brightening at regular intervals. The color of the lights was a blue-white and made me think of glow in the dark. The reason I say they weren't blinking or flashing is because the way the lights dimmed and brightened looked like something was alternately blocking and then not blocking the light. It looked like birds flapping their wings. The lights moved slowly but at a constant speed. When a helicopter flew in to the University hospital, it appeared to startle the lights, because the stragglers moved a little faster and the lights in the middle of the formation moved faster and clumped around the lights in the lead. The lights continued on a straight northwest path until they faded from view. The whole thing lasted about 10 minutes. We didnt lose sight of them becuase of the hills behind the concert venue. We lost them because they went beyond the horizon. They weren't planes: planes do not fly in formation that close and these lights had no blinking red lights. They weren't birds becuase they were flying too high and this is the same reason they weren't balloons. Also, they were too many and the sun had set over an hour earlier. People around us were all trying to get pictures but the distance and low lights made our phone cameras useless. After the concert, I asked the two officers at the exit if they had seen the lights as well. They both said yes, that neither of them had ever seen that before, and that they didn't know what it was either. We discussed this with our friends as we drove home. We concluded that it couldn't be remnants of the Chinese rocket because they weren't falling toward Earth but appeared to be traveling around it and the lights never sh! ot like meteors. Although we don't believe in UFOs, due to the dearth of information on this phenomenon in local news, I am exploring all possibilites. I found this site because of the 8/6/16 sighting in Layton of what sounds like the same thing we saw last night. I wish I had a picture.

Held as-reported from National UFO Reporting Center (record NUFORC #130097). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.