"At this stage of the investigation, preliminary review of the data and debris suggests that a large breach in the cryogenic helium system of the second stage liquid oxygen tank took place. All plausible causes are being tracked in an extensive fault tree and carefully investigated. Through the fault tree and data review process, we have exonerated any connection with last year's ... mishap," SpaceX said.
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The Sept. 1 accident destroyed a $200 million Israeli communications satellite and damaged SpaceX's primary launch site.
SpaceX said it planned to repair the pad, but did not say how much that would cost, nor when it would be returned to service.
In the meantime, SpaceX said it hopes to resume flights in November. The company's second launch site in Florida, located at NASA's Kennedy Space Center, just north of its primary site, is nearing completion.
SpaceX also launches high-inclination and polar-orbiting satellites from Vandenberg Air Force Base in California.