Last-minute technical trouble has forced SpaceX to call off its attempt to launch four astronauts to the International Space Station (ISS) for NASA.
The countdown was halted with just two minutes remaining until scheduled lift-off on Monday from Kennedy Space Center in Florida.
With just a split second to blast-off, there was no time to deal with the problem, which involved the engine ignition system.
SpaceX did not immediately say when it would try again.
The next attempt could come as early as Tuesday, although poor weather was forecast.
Strapped into the Endeavour capsule atop the Falcon 9 rocket were two NASA astronauts, one Russian cosmonaut and one astronaut from the United Arab Emirates.
When informed by SpaceX that the fuel would start to be drained from the rocket, commander Stephen Bowen replied: "We'll be sitting here waiting."
It was expected to take nearly an hour.
Captain Bowen and his crew — including the first astronaut from the United Arab Emirates assigned to a months-long mission, Sultan al-Neyadi — will replace another SpaceX crew that flew to the space station in October.
AP
