Human remains have been found near a site which had previously been searched in the hunt for two missing children linked to Oswestry killer Brian Field.
Emergency services were called to Damson Parkway, in Solihull, West Midlands, following the grim discovery on Wednesday.
Forensic teams could be seen searching the site, which is next to the car giant's huge Solihull plant.
Police investigators at the scene
West Midlands Police has erected a forensic tent at the scene and said the bones will now undergo further archaeological analysis.
A force spokesperson said: "We're investigating after human remains were discovered on land off Damson Parkway, Solihull, on Wednesday (November 4).
"The area has been cordoned off for further searches to be carried out. The bones will undergo forensic and archaeological analysis."
Investigators testing the site
A Jaguar Land Rover spokesperson said they would not be commenting.
The remains were found 600 yards away from where police previously dug while looking for two missing schoolboys who became known as the 'Milk Carton Kids' after disappearing 24 years ago.
Pals 11-year-old Patrick Warren and 13-year-old David Spencer disappeared after they went out to play and never returned on Boxing Day 1996.
The last known sighting of the boys was at a Shell petrol station in Chelmsley Wood, Solihull just after midnight, where an attendant gave them a packet of biscuits.
They were reported missing the following morning on December 27, 1996.
Patrick's red Apollo bicycle, a Christmas gift, was found later at the back of the petrol station next to a phone box, in an area where commercial bins were stored.
Nationwide appeals for information were made, with the boys' faces even being featured on milk cartons in 1997 in a ground-breaking campaign.
The pair also appeared on BBC's Crimewatch programme in 2006 for the tenth anniversary of their disappearance, but no trace of them has ever been found.
West Midlands Police reopened the case, known as Operation Stenley, in 2006 and that year excavated a site near to where human remains were found on Wednesday (4/11).
But police abandoned their search weeks later after finding nothing of significance.
Brian Field
It also lies just half a mile away from where child killer Brian Field lived. He was interviewed as a suspect in 2006 but has always denied his involvement.
Field was jailed for life in 2001 for the kidnap, rape and murder of Surrey schoolboy Roy Tutill in 1968.
He had previously been jailed for four years in 1986 for kidnapping two teenaged boys on New Year's Day near Oswestry. They fled from his car after he threatened them with an iron bar after they refused to undress.
The terrified boys managed to flee from the moving car and tumbled onto a grass verge and raised the alarm.
West Midlands Police said at this stage they were not linking the remains found near the JLR site to any criminal investigation.
JLR's site at Solihull
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here