15-25 light orbs over Southwestern Denver

I was in my backyard, when I took a quick glance at the sky and noticed there were 15 to 25 light orbs in the sky.  These orbs were white/blue and were flying together in a weird pattern. 
I stopped and stared at them for about 20 seconds because I had never seen anything like that before.  I then ran inside my home to let my brother, cousin and mom know what I was seeing and we quickly ran outside to our backyard to see what was going on.
These light orbs were flying toward Northeast Denver and were very silent.  As they were heading Northeast, I noticed another orb light flying at a higher rate of speed and caught up to the rest of the orbs.  We continued observing them as they flew through the clouds. 
We noticed that three of them stopped and we lost site rest of the rest.  These three orbs were stationary for about 5-10 minutes and then disappeared.