Officers rescued four people from the back of a lorry near Cambridge over the weekend prompting a fresh plea for people to be vigilant on the roads and report anything suspicious.
Just after 12noon on Saturday (20 March), police received a call for help from one of the four people inside the vehicle.
The lorry, believed to have come from Dover, was stopped just before junction 11 of the M11 near Trumpington. Those rescued from inside were not injured and their welfare is now being handled by the immigration services.
The driver was arrested on suspicion of assisting illegal entry into the UK, but has since been interviewed and will face no further action.
News of the weekend lorry rescue follows two similar incidents last month, where 21 people were rescued from lorries in Cambridgeshire. Some had told officers over the phone that they were struggling to breathe.