The unmanned SpaceX Falcon 9 rocket exploded on the launch pad at Cape Canaveral, Fla. during a test on Sept. 1, destroying the rocket and an Israeli satellite called Amos-6. The explosion occurred two days before the rocket's scheduled liftoff.
About two weeks later a SpaceX employee asked for access to the roof of a building leased by ULA, according to the Washington Post, which cited three unnamed industry officials with knowledge of the episode. The Post reports that SpaceX had still video images that appeared to show an odd shadow, then a white spot on the roof.
The building has a clear line of sight to the launch pad, which is just over a mile away.