During a pre-launch test this morning, a SpaceX Falcon 9 rocket exploded in Cape Canaveral, Florida. The spacecraft was sitting on a launchpad ahead of a scheduled launch this Saturday to take an AMOS-6 communications satellite into orbit for the Israeli company Spacecom. That satellite is a joint effort between Facebook and France’s Eutelsat to provide internet connectivity to 14 African countries. Some reports indicated that the explosion shook office buildings some distance away.

Engadget reports that 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.