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Vitoria, Spain, Jun 4 (EFE).- The human remains found at a martial arts gym in the northern Spanish city of Bilbao belong to a single person, sources involved with the investigation told Efe.

Last Sunday, the Basque regional police arrested the owner of the gym for binding and then beating a Nigerian woman, leaving her in a coma and, when searching his gym, they found human bones.

Police had been called by a witness who early Sunday afternoon had seen a woman being forced into the gym.

Juan Carlos Aguilar, 47, on Monday confessed to police that he had killed another woman a few days ago and now investigators have determined that the remains are of a single person, a woman of Colombian nationality but about whom they have not provided any further details.

The Basque police thus have managed to clear up one of the main unknown elements of this case, given that it was not known up to now if the bones found in Aguilar’s gym belonged to one or several people.

The presumably murdered woman in all likelihood is the one Aguilar mentioned on Monday in his confession to police, saying that “he thought” he had killed a woman on May 31, although he added that he was confused on that score.

Police confirmed that Aguilar has been in treatment for two years for a brain tumor, but it is not clear if that circumstance could have altered his mental state.