A group of suspected migrants were rescued from a lorry's refrigerated trailer after calling police for help on the M25, officers have said.
Surrey Police said 10 adults and three children were removed from the HGV in Chertsey at around 3.10pm on Tuesday.
The force said it received calls from multiple people inside the vehicle.
An officer spotted a lorry matching the description given by one of the callers and it was stopped.
The people were given the all-clear by the South East Coast Ambulance Service before being detained on suspicion of illegally entering the UK, the force said.
The adults were detained in Dover, Kent, while the children were placed in the care of social services.