The night of june 29, 2017 roughly around 9:30 pm my grandma and i were driving out of downtown phoenix, az. we were down highway 202 and rural road. i looked out the window and saw a very large swarm of hovering twinkling red lights. it looked like there were hundreds of lights in the shapeless swarm and they were packed closely enough that we would tell that they were not attached on the surface of any object. the swarm was high in the air and could be seen several miles away. it was not close to any tall buildings and was much larger than a blimp. we couldn't believe our eyes and couldn't find any explanation for the swarm of lights online or on the news. we lost sight of the swarm as we turned on to the 101. we aren't sure of the lights on the swarm moved at all but they did twinkle slowly. this event happen over a major metropolitan area near a major highway so there must be other witnesses out there.