Seven suspected illegal immigrants were detained in Haverhill on Thursday.
Suffolk Police were called at 5.15pm to reports a lorry had arrived at a business premises in Iceni Way with suspected migrants inside.
A police spokeswoman said: “Officers attended and seven people were found inside. They were detained, received appropriate medical care and immigration authorities were notified.”
A Home Office spokeswoman said they presented themselves as Iranian and Iraqi nationals and were taken into custody on suspicion of entering the UK illegally.
She added: “One man remains in custody, a claimed minor has been passed to social services to be age-assessed and a family of five was taken into temporary accommodation.
“All of their cases will be progressed in line with the immigration rules.”