Nottinghamshire Police have arrested a 22-year-old man from South Yorkshire on suspicion of murder after the body was discovered in a lane near the village of Everton, close to Bawtry, on Saturday.
Four people from South Yorkshire, a 47-year-old woman and three men, aged 31, 27 and 21, remain in police custody after their arrest on Monday. A 13-year-old girl who was arrested has been released without charge.
Post mortem tests into the man’s death have proved inconclusive.
Inquiries are under way to identify the victim and trace next of kin, with South Yorkshire Police assisting the investigation.