Elon Musk says the SpaceX rocket that blew up into a fireball on a Cape Canaveral launch pad is proving to be the most complex failure the firm has faced in 14 years.
The Falcon 9 rocket blew up on September 1, destroying a Spacecom communications satellite which included a Facebook project designed to expand internet access in sub-Saharan Africa.
In a Tweet Friday, Musk outlined the challenge facing the investigation which involves NASA, the Air Force and the Federal Aviation Administration.
@elonmusk: Still working on the Falcon fireball investigation. Turning out to be the most difficult and complex failure we have ever had in 14 years.
As the company tries to piece together what went wrong, SpaceX asked people with audio, photos or videos of the incident to forward the materials to the company.
@SpaceX: If you have audio, photos or videos of our anomaly last week, please send to firstname.lastname@example.org. Material may be useful for investigation
Shortly after the accident, SpaceX CEO Musk said the explosion happened when propellant was being loaded but the actual root cause has yet to be determined.
Today Musk said there is still no obvious cause.
@elonmusk: Important to note that this happened during a routine filling operation. Engines were not on and there was no apparent heat source.
Musk also used Twitter to ask anyone for support and advice from people, particularly those who had recordings of the event.
@elonmusk: Particularly trying to understand the quieter bang sound a few seconds before the fireball goes off. May come from rocket or something else.
Israel's Space Communication, who lost the satellite in the inferno, said Sunday it could seek $50 million or a free flight from SpaceX.
In a final tweet Musk said he would return to working on a blog posting updating on Tesla's autopilot software tomorrow.