The high speed crash that killed Paul Walker and Roger Rodas caused a huge explosion and fireball that could be seen for miles ... and it was all recorded on a security camera that captured the precise moment of impact.

The footage was recorded from a rooftop camera in an industrial park next to the crash site. It shows the initial collision (on the right of the screen) which caused the Porsche to explode in flames ... moments before another, larger blast sends a fireball high into the sky.

What's also interesting -- there appears to be no other cars either immediately in front of or behind the Porsche at the time of the crash.