Eight people were found in the back of a lorry after fruit was spotted being thrown from the vehicle.
Drivers stuck on the A14 in Cambridgeshire after a crash reportedly spotted the fruit and police were alerted.
Officers stopped the lorry near Brampton Hut services in Cambridgeshire at about 12:00 GMT.
Three people were taken to hospital and a man has been arrested on suspicion of assisting unlawful immigration.
The road was closed while paramedics and a Magpas Air Ambulance crew treated patients.
A photo of the lorry reportedly shows where oranges were being thrown to attract attention.
None of the people taken to hospital had serious injuries. The investigation will be handed to immigration services.
The A14 at Brampton is closed following reports of concerns for 8 people travelling in a lorry. The lorry has been stopped and emergency services are on scene. Three people are being taken to hospital but no one is believed to be seriously injured. 👉 https://t.co/DvNnbRd7fC pic.twitter.com/FC5Z9BCzHs— Cambs police (@CambsCops) November 19, 2019