A Lithuanian lorry driver and three Kurdish men have been arrested on suspicion of immigration offences after a group were spotted disembarking from a lorry near the A1M near Boroughbridge.
Searches are continuing today for five men seen leaving the lorry - with householders in the Boroughbridge area urged to check their sheds and outbuildings.
North Yorkshire Police received reports of a group people getting out of a vehicle on on the A168 near the J48 turn off of the A1M near Boroughbridge at 6.40pm on Thursday.
Officers attended the scene and a have traced and located a number of the group.
The driver of the lorry, a 49-year-old man from Lithuania, has been arrested on suspicion of an immigration offence and remains in police custody.
Three other men aged 20, 24 and 29, of no fixed address but believed to be from the Kurdish region of the Middle East have also been arrested on suspicion of illegally entering the UK. They remain in police custody.
A mother and three children, a young woman and a single mother with two children were taken to Harrogate Police Station and have since been transferred into the care of the local authority.
North Yorkshire Police said they still believe that there are missing people from the lorry and have received reports that around five men of Asian appearance were seen walking north on the A1 last night. Despite extensive searches, including the assistance of the National Police Air Service, they remain outstanding.
The searches for the missing men are continuing today and police have appealed to members of the public in the Boroughbridge area and towns and villages along the A1 corridor to report any sightings of the men.
They are also appealing to members of the public to check their sheds and outbuildings for signs of occupation in case any of the missing men have taken shelter there.
Anyone with any information is asked to contact North Yorkshire Police on 101, select option 1 and pass information to the Force Control Room.
If you have an immediate sighting of the men, please call the police on 999.