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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.

Shortly after the accident, SpaceX CEO Elon 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.

Musk also used Twitter to ask anyone for support and advice from people, particularly those who had recordings of the event.

Israel's Space Communication, which lost the satellite in the inferno, said Sunday it could seek $50 million or a free flight from SpaceX.