This happened before the horrific attacks in France so not making light of that event. But if you look at the video (link below) The "explosion" in the sky is pretty frightening looking. Thankfully it was just a test.
"An amateur photographer thought the world was ending when she caught pictures of a Trident missile in action near Los Angeles.
The series of pictures captured by Porter Tinsley, who posted them on her blog Less Than Amateur, show a white halo backdropped by the Milky Way. She took the pictures while standing on Bombay Beach, two and a half hours away from L.A., on Saturday (Nov. 7) during one of two Trident missile tests over the weekend. You can see a time-lapse video of the missile test here made from Tinsley's amazing photos.
"When it exploded and kept expanding, I realized it wasn’t a plane on fire but thought there was a good chance that a chemical or nuclear weapon had detonated over Los Angeles/Southern California," Tinsley wrote on her blog, where you can see more photos of the event.
"All I could do was stand there and realize life as I knew it could be over in a few minutes. So I did what anyone else would do. I took pictures of it."