Thirteen children aged between one and 12 were among 35 Afghan Sikh immigrants found in a shipping container at Tilbury Docks, Essex Police have said.
The group arrived on Saturday on a ship from Belgium and were said by police to be victims of "people trafficking".
One man was found dead and the others were taken to hospital to be treated for severe dehydration and hypothermia.
The 30 people released to police include nine men and eight women aged between 18 and 72.
They have been brought to a makeshift reception centre set up inside the terminal buildings at Tilbury Docks.
Police said they are "being spoken to about their ordeal" before they are passed on to the UK Border Force.
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