A 44-year-old man from Spain has been arrested on suspicion of human trafficking after people were seen getting out of a lorry on a motorway.
People were seen exiting a lorry on the hard shoulder of the M2 north of Maidstone in Kent on Saturday, police said.
The motorway was shut while officers investigated.
After a search of the area, six people were located and handed over to Home Office officials, Kent Police said.
A force spokesperson added: "A 44-year-old man from Spain was also arrested on suspicion of human trafficking and has since been released pending further enquiries."