York Police and paramedics are at the scene of a multi-vehicle collision in King Township.
Police say that 12 people have been injured one of whom was airlifted to a trauma centre.
3 of the injured were children though the person who was airlifted to hospital was an adult. Police at the scene say 11 people were taken to local York region hospitals with relatively minor injuries.
It appears one vehicle crossed over the centre lane for an unknown reason and caused the crash.
The investigation is ongoing and there is no word yet whether charges could be laid.