Six triangle flying objects flying high in circular motion and then just disappeared

I saw a glint of light appear in the sky as I was driving and looked up through my front windshield to see 6 objects flying around each other and in circular motion.  I tried to capture on video but they did not appear on my phone screen.  They were shiny on one side. My granddaughter and her friend also witnessed these 6 flying objects.  Then they just disappeared.  They were triangle shaped and appeared very high in the sky.