Watch the Falcon 9 launch from pad 39A

SpaceX is more than a week into a company-led probe of a launch pad explosion Sept. 1 that destroyed a Falcon 9 booster and an Israeli communications satellite, but the investigation so far has turned up no smoking gun on the cause of the mishap, Elon Musk said Friday.

Mike Suffredini, manager of NASA’s International Space Station program, is stepping down after 10 years overseeing the lab’s final assembly and transition to post-shuttle operations, the agency said Wednesday. Kirk Shireman, deputy director of the Johnson Space Center, will take over as program manager.

A three-man crew departed the International Space Station on Sunday, concluding more than five months aboard the orbiting research complex and heading for landing in Kazakhstan. Undocking of the Soyuz MS-07 spacecraft occurred at 0916 GMT (5:16 a.m. EDT), and the trio landed on the Kazakh steppe at 1239 GMT (8:39 a.m. EDT).