China's moon rover "Yutu" (Jade Rabbit) has had a mechanical control abnormity, and scientists are organizing an overhaul.

The abnormity occurred due to "the complicated lunar surface environment," the State Administration of Science, Technology and Industry for National Defence (SASTIND) said on Saturday, without giving further details.

The abnormity emerged before the rover went into its second dormancy at dawn on Saturday as the lunar night fell again, according to the SASTIND.