The accident happened just after 8pm on Tuesday.
The road is completely closed as a result of the accident, according to the Swedish Transport Agency.
SOS Alarm states that four ambulances have been sent to the accident, as well as the emergency services.
At 20:45, the police state that three people were taken to hospital by ambulance.
It concerns two boys and a girl, all under the age of 18, who were traveling in the A-tractor.
The condition of the injury is not known.