An international crew of four astronauts had their planned launch to the International Space Station from Florida on Thursday postponed over bad weather, delaying a mission that had been watched by a rare gathering of senior Russian space officials in town for a meeting with NASA's acting chief.

It’s a last-minute weather scrub for SpaceX’s latest crew launch for NASA. Clouds rolled in and prompted SpaceX to call off Thursday’s planned liftoff of four astronauts to the International Space Station.