Thirteen illegal immigrants have been found in a lorry stopped in the Daventry district.
The Iranian nationals were discovered in a vehicle that had come from Dover as it had got to the Daventry International Rail Freight Terminal in Crick this afternoon.
Police said they were called to Danes Way, which is just off junction 18 of the M1, at about 3pm after the driver heard banging coming from the back of the vehicle.
A spokesman said officers discovered 12 adults and one child.
Eleven of the adults were handed over to UK Border Agency officials and a woman, who was pregnant, was taken to hospital with police officers in attendance.