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 from Northern Ireland has been arrested on suspicion of murder.
The lorry is from Bulgaria and entered the country at Holyhead, North Wales, one of the main port for ferries from Ireland, police said.
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