A Russian space capsule carrying a humanoid robot has failed to dock as planned with the International Space Station.
A statement from the Russian space agency Roscosmos said the failure to dock on Saturday was because of problems in the docking system.
It said the space station itself and the six-person crew are safe.
Vladimir Solovyev, flight director for the Russian segment of the ISS, said a new docking attempt would be made on Tuesday.
The capsule was launched on Thursday as part of tests of a new rocket that is expected to replace the Soyuz-FG next year.
It is carrying a robot called Fedor, which will perform two weeks of tests aboard the space station.
Mr Solovyev said the robot had not been taught how to manually conduct a docking.