Fifteen suspected illegal immigrants, including a family of three and a child, have been detained at a service station on the M25.
Surrey roads policing unit tweeted they were called to deal with the group at Clacket Lane services in Surrey on Saturday night.
Police said the group were detained on suspicion of entering the UK illegally.
The government said one of the 15 who claimed to be a minor had been referred to social services.
A spokesman for the Home Office said immigration officers were sent to the services between Junction 5 for Godstone and Junction 6 for Sevenoaks, Kent, after receiving the alert from Surrey Police.
He said: “A total of 15 people, presenting themselves as Iraqi and Iranian nationals, were discovered at the scene and are currently awaiting interview by immigration officials.”
Surrey Police said they would not be releasing any further information.