The Romanian driver of the lorry has been arrested by the French border police who will investigate.
Dave Hutchinson, Border Force Deputy Director for South East & Europe, said: “The dangers of using refrigerated lorries and sealed tankers in this way are self evident. The consequences are potentially fatal."
In 2000, 58 Chinese immigrants died after being sealed into the back of a lorry which was stopped at Dover.
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Holly has Friday's forecast for the east of the region.
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The jury in the trial of an Army sergeant accused of attempting to murder his wife has been discharged - unable to reach a verdict.