FORENSIC specialists from Wiltshire Police are investigating a field near Junction 15 of the M4.
Neighbours on Meadow Way in Badbury Wick, Swindon, first noticed the police presence on Wednesday.
Detective Chief Inspector Darren Hannant said: “We are investigating the discovery of what we suspect to be old human remains close to Junction 15 of the M4.
“Specialist officers are currently conducting a meticulous search of the area to recover any relevant material before forensic scientific analysis is conducted.
“This sort of investigation can take a number of weeks however we will endeavour to provide updates where we can as this work continues.
“Members of the public will see a police presence in the area over the next few days and weeks.”