One person has been hospitalised after being found in the back of a lorry near the Dartford Crossing in Kent, along with 12 other people.
A South East Coast Ambulance Service spokeswoman said the person taken to hospital was not believed to be in a life-threatening condition.
They said: "Our crews assessed 13 individuals at the scene. One required transportation to hospital and they were taken to the Darent Valley Hospital. "They didn't appear to be in a life-threatening condition. The other 12 were taken to Dover."
Kent Police confirmed they were called to a report of suspected illegal immigrants but said that the immigration service was managing the investigation.
More top news
Eagle-eyed Twitter users spotted that a campaign photo the party claimed was in Stoke on Trent, was actually in Bolton.
The body of a man from Chichester who died after travelling to Syria to fight Islamic State arrived back at Heathrow to a hero's welcome.
London Mayor Sadiq Khan hinted that he could go further in his bid to tackle pollution in the capital.