A murder investigation has been launched after 39 bodies were found inside a lorry container on an industrial estate.
The victims, found at the Waterglade Industrial Park in Grays, included one teenager, Essex Police said.
A 25-year-old man has been arrested on suspicion of murder. He has been named locally as Mo Robinson from Portadown in Co Armagh, Northern Ireland.
Prime Minister Boris Johnson said the perpetrators of the crime "should be hunted down and brought to justice" as police began the task of identifying the victims.
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