SpaceX was static firing the Falcon 9 engines ahead of this weekend's launch at Space Launch Complex 40 (SLC-40), a process that's standard procedure. During that test, the Air Force Museum at the Kennedy Space Center closes, however SpaceX does have a personnel building close to the launchpad. The Verge reports the US Air Force 45th Space Wing says there no known casualties and there's not a threat to the general public. Last year, a Falcon 9 broke up shortly after launch on a resupply mission to the International Space Station.

SpaceX says the explosion was caused by "an anomaly" on the launchpad, but the area was clear so there were no injuries. The company didn't offer any word on an exact cause and it may be a while before more information is discovered, but the Falcon 9 and its payload, the AMOS-6 satellite, were both destroyed. Here's the full statement:

Statement on this morning's anomaly pic.twitter.com/3Xm2bRMS7T — SpaceX (@SpaceX) September 1, 2016

Update: SpaceX CEO Elon Musk tweeted that the explosion occurred while the Falcon 9 was being filled with propellant. He also explained that it started around upper stage oxygen tank, but the exact cause still unknown for now.

USLaunchReport has posted a video of the incident to YouTube. We've embedded it below.