Police investigating the desecration of a woman's grave will resume their search of woodlands where animal rights extremists claim to have buried her.
Gladys Hammond was the mother-in-law of a guinea pig breeder
Around 100 officers began searching Brakenhurst Wood, Newchurch, Staffordshire, on Tuesday.
The body of Gladys Hammond, 82, was taken from a church in Yoxall, Staffs in October. Her relatives run a guinea pig breeding farm in nearby Newchurch.
A group called The Animal Rights Militia claimed she was buried locally.
Police said the search is expected to last until Thursday.
Despite appeals for the group to reveal the exact location they have not made contact again.
Det Chief Insp Nick Baker, who is leading the investigation, said: "The Animal Rights Militia have not made contact since our appeal leaving us no option but to carry out these extensive and time-consuming searches.
"We have carried out limited searches at Brakenhurst Wood, which is over 90 acres in size, in the past.
"Teams of officers will be involved in thorough searches of carefully selected areas of the wood.
"We would ask members of the public to help us by staying away from the wood while our searches go on and thank them for their patience.
"This complex investigation is progressing well and our goal remains to catch those responsible and find Mrs Hammond's body."
Mrs Hammond, who was buried in St Peter's churchyard seven years ago, was the mother-in-law of Christopher Hall, part-owner of Darley Oaks Farm. The farm breeds animals for medical research,
The Hall family has been subjected to a long-running campaign of intimidation by extremists, including hate mail, malicious phone calls, hoax bombs and arson attacks.
Staff have also received death threats.
The group sent letters to the BBC and the Burton Mail newspaper in April, claiming one sixth of Mrs Hammond's remains were buried in a sealed plastic container 2ft underground in the woods.