The latest SpaceX rocket was reduced to a burning pool of scrap metal today after an "anomaly" during propellant fueling.
SpaceX reports that luckily there were no injuries or deaths during the explosion, as all personnel were clear of the facility during the catastrophic failure. You can read the full update on the situation here
SpaceX tests new advances in technology every launch, it's likely that a change they made here was not implemented perfectly, and resulted in the explosion.
Check out the video: