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SpaceX founder Elon Musk said Monday that a “relatively small” methane leak caused the explosion of the company’s latest Starship test rocket last week on an experimental flight over South Texas.

SpaceX has delayed the launch of the SES 12 communications satellite until shortly after midnight Friday at Cape Canaveral, allowing teams additional time to complete pre-launch vehicle checks and wait for improved weather conditions. The launch, which was previously set for Thursday, is expected around 12:29 a.m. EDT (0429 GMT) Friday.

The mission was the second of potentially three Falcon 9 flights set to take place this week. Liftoff from pad 40 at Cape Canaveral Space Force Station happened at 10:35 p.m. EDT (0235 UTC).