An investigation was launched today into the incident which left 13 people injured in the Network Q Rally of Great Britain.
Two people, including a 13-year-old girl, will undergo surgery for injuries after a car driven by Spain's Carlos Sainz ploughed into a group of spectators in the Brechfa forest, near Carmarthen, in west Wales yesterday.
The accident happened on special stage 11 of the rally which finishes in Cardiff later today.
Rally organisers revealed today that nine people who had suffered minor injuries had been discharged from West Wales General Hospital in Carmarthen last night.
"A 12-year-old boy with severe bruising is expected to leave hospital today; a 13-year-old girl is still in hospital and is expected to have surgery on a lower limb injury," said John Horton, the National Media Delegate for the rally.
"One adult with head injuries is expected to be discharged later today and the adult with back injuries will be staying in hospital for another night."
Two air ambulances had been deployed to take the injured to hospital after Sainz's Ford Focus went straight on at a bend and hit another car and the group of spectators.
The two-time world champion was withdrawn by his team from the rally at the end of the stage which was scrapped by the organisers.
The investigation will be carried out by the Motor Sports Association, the sport's governing body in Britain, and a report will be made to FIA, motor sport's world governing body.
Meanwhile, Richard Burns slipped to third place today but stayed on course for his first world title.
Finland's Marcus Gronholm led after completing the slippery 14th stage with a one minute and 36 second advantage over team mate and compatriot Harri Rovanpera.
Burns was a further 26.7 seconds behind after a cautious run through the 26.93km Rheola stage.
Three competitive stages remain before the cars return to rally headquarters in Cardiff.
PA