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4 arrests in large UK slavery investigation

LONDON — Welsh police arrested four people and combed the grounds of a stable outside the capital city, Cardiff, on Tuesday, hunting for a body in a long-running slavery investigation.

Gwent police said in a statement that more than 100 officers were involved in searches at the yard, as well as an apartment in Cardiff and a house in the small Welsh village of Penhow.

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The force said it was acting on suspicion that people were being kept in poor conditions at the site ‘‘and forced to work for no pay.’’ Police said that an unnamed man — believed to be a Polish national — was recovered from the site on Monday and is being assessed by police and British Red Cross personnel.

Police added that horses found at the stable were being examined by animal welfare experts.

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