Two Indian men were prevented from illegally entering the country after they were caught hiding in a lorryload of fertiliser heading for West Yorkshire.
The stowaways were discovered on Saturday in Calais, France,
by UK Border Agency officers as they checked vehicles bound for Dover.
Officers were alerted to the presence of the two migrants by
a sniffer dog trained to detect potential stowaways.
Opening up the lorry trailer, the officers discovered the two men, removed them and handed them over to the French authorities.
The Romanian-registered vehicle, which had a Romanian driver, was allowed to continue on its journey to Knottingley.
However, both the driver and the haulier may now be liable
to a fine of up to 2,000 per stowaway if they are unable to prove they took steps to secure the vehicle.
Carole Upshall, the UK Border Agency's director for european operations, said: "Detections like this one clearly show the importance of having UK Border Agency officers based in France.
"They are there to stop would-be illegal immigrants before they can reach the UK and then heading for places across Britain – in this case Knottingley."