A family of four, including two boys, are in the hands of immigration officials after they were found in the back of a lorry in Spalding.
The family, all from Iran, were discovered in a refrigerated lorry parked in a layby near McDonalds restaurant on the A16 last Thursday.
Both the driver and passers-by were alerted by banging heard from inside the Spanish-registered lorry which was carrying cabbages and broccoli to a firm near Boston.
A 43-year-old man, a 35-year-old woman and two boys, aged ten and two, were treated by paramedics for the effects of the cold and the two-year-old was later taken to Pilgrim Hospital, Boston, as a precaution.
The family have been bailed to an address in Birmingham while officials from UK Visas and Immigration, part of the Home Office, are considering an application for them to stay in the country.
It was the second such incident in a week after four men, three from Syria and one from Iran, were found in the back of a lorry at Sutterton Roundabout on May 1.
There were similarities with the Spalding case in that the lorry was again Spanish-registered, refrigerated and contained cabbages, as well as the alarm being raised when banging was heard from inside the vehicle.
A Home Office spokesman said: “We work closely with police to tackle illegal immigration and where someone is found to have no legal right to remain in the UK, we will take action to remove them.”