There is a breathless video on the internet purporting to show a blue streak coming from the sky milliseconds, ie: ‘in a blink of an eye,’ before the RV exploded on the streets of Nashville, Tn. The camera that caught the explosion was apparently a fixed outdoor surveillance device overlooking a parking lot or something, a half mile away. It was around 0630 am.
I could not see a blue streak coming from the sky. What I believe the camera recorded was the flashing blue lights of police vehicles already there reflecting off the smoke of the explosion. That explanation satisfies my own experience as a crime scene investigator. For the record, I graduated from the National Fire Academy arson investigators school.