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LONDON (AP) Police have arrested three more people as part of a long-running investigation into a suspected slavery ring in Wales, bringing the total number of arrests to seven.

The arrests come as Gwent Police said Wednesday that a 60-year-old potential British victim was found in St. Brides, a rural area outside the capital city of Cardiff. A Polish man was discovered at a nearby farm.

Authorities haven't yet determined whether the men were believed to have been held as slaves; a police spokeswoman described them as "potential victims or witnesses."

Police say their investigation into potential slavery offenses was sparked by the discovery of a missing man who was found living "in very poor conditions" in the area earlier this year. He had disappeared some 13 years ago.