Two children have been found in a car believed to be stolen following a police chase.
The youngsters were in the back of the Toyota when it failed to stop on the M25 between Leatherhead and Wisley.
Members of the public reported that a number of people got out of the car and then ran from the vehicle, possibly across the A3.
One person is believed to have run to a nearby slip road and stolen a Toyota vehicle, which was stopped at the time following a brief confrontation with the driver.
Surrey Police are appealing for witnesses "as a matter of urgency".
Anyone with information about the incident can call Surrey Police on 101 or Crimestoppers anonymously on 0800 555 111.