Red triangle in Bensalem Pennsylvania

I was in my front yard and looked up in the sky, I saw four groups of three lights. I at first thought they were planes, until I noticed all four groups were shaped in triangles, also there was no noise. I was also shocked as there was no noise. One group disappeared, just seemed to faint out. All other three groups fainted out at the exact same spot. I looked up some photos on the internet and noticed that I saw the same thing as the photos