A Romanian man has been arrested on suspicion of assisting unlawful immigration, a Border Force spokesman said.
He added that eight Afghani nationals have also been detained and a criminal investigation has been launched by immigration enforcement officers.
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.