SpaceX Falcon 9 rocket explodes during test firing

Smoke from a fire at a launch pad after a SpaceX Falcon 9 rocket exploded in Cape Canaveral, Fla.

Smoke rises from a SpaceX launch site at Cape Canaveral, Fla. NASA said SpaceX was conducting a test firing of its unmanned rocket when a blast occurred.

April 2016 image of Space X’s Falcon 9 rocket lifting off with an unmanned Dragon cargo craft from the launch platform in Cape Canaveral, Fla. A SpaceX Falcon 9 rocket exploded Sept. 1 on the launch pad at Cape Canaveral during a test firing.