A group of adults and children found in container at Tilbury Docks are from Afghanistan and are of the Sikh faith, Essex police say.
Thirty-five people were found in the container yesterday morning, with one man pronounced dead at the scene.
Some 30 people have now been released from hospital and are in the care of Essex Police and Border Force staff at the Port of Tilbury.
Four remain at Southend Hospital, but are expected to be discharged later.
Essex Police said all of the stowaways will be taken care of by the Border Force once they have been questioned.
The uncle of dead Afghan immigrant Meet Singh Kapoor says he wanted a better life for his children. Instead his children watched him die.
ITV News has spoken to the translator police used after 35 Afghan Sikhs, including 13 children, were found in a boat in Tilbury Docks.
ITV News has obtained exclusive footage of people, believed to be Afghan Sikhs, being released from a shipping container at Tilbury Docks.