Police were called just after 2pm on Tuesday (26 November) to reports of concerns for ten people travelling westbound in a lorry on the A14.
Officers stopped the vehicle at the Shell garage in Godmanchester.
Ambulance attended and those within the lorry have been taken to hospital, but no one is thought to be seriously injured.
Two people have been arrested - one on suspicion of assisting unlawful immigration and the other for suspected firearms offences.
Immigration services have been notified. Enquiries continue.