Lynn police were called in to help with scores of suspected illegal immigrants which were found hiding in a lorry earlier this week.
Cambridgeshire police stopped a lorry on Tuesday on the A1 northbound with the junction with the B1081, near Stamford.
Officers received information from colleagues in Hertfordshire about 30 possible immigrants in the back of a French lorry, which was travelling north of the M11.
A total of 27 people, all men, were arrested for immigration offences and were processed at the Lynn Police Investigation Centre, in Saddlebow, along with the Thorpe Wood Police Station.
The Lynn police station was used to process five people to help colleagues in Cambridgeshire .
Five of those detained were taken to Peterborough City Hospital for treatment as they were believed to be suffering dehydration.
A 54-year-old man from Dover was arrested on suspicion of assisting unlawful entry to the UK and was later bailed to return to Thorpe Wood Police Station on Monday, August 17.
Some of the people found in the lorry were as young as 13 years old and from countries such as Afghanistan, Syria, Pakistan and Kuwait.
They have now been released from police custody with no further action.
But they have been referred to staff at the immigration services.