UFO Sighting in Arvada, Colorado on 2017-07-04 21:30:00 - 4 orbs in sky over denver

We were watching fireworks and then saw 4 hovering orbs about 30-45 seconds after seeing them i was able to get my camera out and record. the orbs stayed in one spot for several seconds then would cone together as one then separate they formed a y shape, then a line before disappearing one at a time. they were not fireworks as they stayed in the sky for at least 2 minutes. my video is 1:49 and it was at least 30-45 seconds if not longer before i realized what was happening and grabbed my phone to record.