Avon and Somerset Police say they have stopped a lorry containing 20 people suffering from possible dehydration.
The vehicle was stopped at a service station off the A303 at Southfields roundabout near Ilminster, Somerset at about 1pm.
"Their health and welfare is paramount as we try to piece together with the immigration authorities exactly what has happened," a police statement said.
More top news
A pair of cyclists made the shocking discovery of a baby at the bottom of a drain in Australia.
A weather warning is in place across the south-east with heavy rainfall expected. Elsewhere there will be plenty of sunshine around.
Britain's Lewis Hamilton will join an elite club of double Formula One champions if he can secure a top-two finish in Abu Dhabi today.