Twenty migrants have been discovered in the back of a lorry at the Port of Tyne.
Border officers were called to the facility after 20 people from Albania and Syria were found in the back of a lorry travelling from Amsterdam.
It is understood 15 of the migrants were returned to the Netherlands by ferry on Tuesday night after attempting to enter the country illegally.
Two adults are in immigration detention centres, and two children have been passed to social services for age assessments.
A 35-year-old man was arrested on suspicion of facilitation of illegal immigration, and a 32-year-old Polish man was also arrested on suspicion of facilitating illegal immigration.
Investigations are now under way.
Last week, 71 migrants were found dead in an abandoned lorry in Austria which is believed to have travelled from Bulgaria.
The crossing at Calais has been plagued with problems all summer amid a growing migrant crisis.