Mr Ambrose Aisabor, the state Commissioner of Police announced this when he briefed journalists in llorin.
Aisabor said there were decomposed headless body of a male, human feet, snail shells and clothes suspected to be used in strangulating victims.
He said no suspect had been arrested in connection with the crime but 85-year old woman who claimed to be the owner of the building was being interrogated.
The commissioner said investigation revealed that some people involved in rituals had turned the abandoned building into a market where they bought human body parts.
In another development, Aisabor announced the arrest of one Ganiyu Lawal, an armed robbery suspect.
The suspect was alleged to have stolen a Toyota Camry car with registration number Lagos APP 645 AW from where it was parked in Lagos.
The commissioner said other members of the gang were at large.
Also, two students of the Kwara State College of Education, Ilorin, Joshua Ayantola, 26, and Adebayo Adeyinka, 24, have been arrested for alleged criminal conspiracy and armed robbery.
According to the police chief, the two suspects were arrested for allegedly robbing one Musa Azeez and others, of various items, including money at gun point.
He said the two students had confessed to the crime and would soon be charged to court.
Aisabor commended the people of the state for providing the police with useful information on crime reduction.
He assured that the police would treat all information with confidentiality.