Four people were rescued from the back of a lorry on Saturday after calling the emergency services for help.
Those inside the lorry were not injured, police said, with immigration officials now handling their welfare.
Officers stopped the lorry just before junction 11 of the M11 near Trumpington, on the outskirts of Cambridge, the region’s police force said.
The lorry is believed to have come from Dover.
The vehicle’s driver was initially arrested on suspicion of assisting illegal entry into the UK, but Cambridgeshire Police have said they are not facing further action after being interviewed.
Last month the force rescued 18 people from the back of a refrigerated lorry at Haddon service station on the A1M near Peterborough.
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The driver alerted the authorities after realising there were people on board and becoming concerned for their welfare.
The 13 men and five women identified themselves as Eritrean.
None of the passengers were injured.
People are urged to call 999 if they see people emerging from a lorry or HGV, if they hear banging from inside a lorry or if they see people entering the back of a lorry.
