A seven-year-old Afghan boy was rescued from a lorry after sending a textsaying he feared he could suffocate.
The child was among 15 people discovered by police in the vehicle at a service station on the M1 in Leicestershire.
The boy, who had been living in the Calais camp known as the Jungle, sent a message saying he was running out of "oksijan" - referring to oxygen - and pleading for help.
He is thought to have stowed away in a lorry bound for the UK with his elderbrother.
During the day the younger boy sent a text to a volunteer at a small charitycalled Help Refugees, which works in northern French camps.
She was in New York at the time but alerted Tanya Freedman in the UK.Ms Freedman said:
Using an interpreter the force spoke to the boy and the lorry was traced to Leicestershire.
Ms Freedman said: "They broke in the back and got everybody out."
Leicestershire Police said it was called by a partner agency to LeicesterForest East service station just after 3pm on Thursday.
Fourteen people were arrested on suspicion of being illegal entrants to the UK. In addition, a man was arrested on suspicion of assisting illegal entry.
A spokeswoman for the force added: "Safeguarding measures were put in place for a child who was found in the truck."
The case is now being dealt with by immigration services.