A nine-year-old girl has been seriously injured at Long Toft Primary School in Doncaster
The other children, described as a five-year-old boy, and a two-year-old girl suffered minor injures and were airlifted to Sheffield Children’s hospital.
The nine-year-old girl’s injuries are thought to be serious but not life threatening.
Police said the incident had taken place at Long Toft Primary School in Doncaster, South Yorkshire, this morning.
A South Yorkshire Police spokeswoman said: "Just before 8.40am this morning, emergency services were called to reports of a collision in Doncaster.
"It is reported that a car was involved in a collision with three children, while performing a manoeuvre in the car park of a primary school on Church Road.
"A nine-year-old girl, a five-year-old boy and a two-year-old girl have been taken to hospital.
"The five-year-old and the two-year-old are said to have suffered minor injuries during the collision.
"At this time, the extent of injuries to the nine-year-old is not yet known."
- Pedestrians escape car accident
- Star Trek’s Anton Yelchin killed in freak car accident
- Horrific crash leaves bus torn apart by train
Alison Buxton, the head teacher of Long Toft Primary School, said: "There was an collision on the school premises this morning where three children were injured.
"We have been working with the police and the council's health and safety team to establish the circumstances surrounding this collision.
"Our thoughts are with the children who have been injured and their families."
- M4 crash: One dead, two injured in horror smash between car and lorry
- WATCH: Bad driver smashes into wall only for THIS to happen
- Natural History Museum crash: Police release man from custody