Detectives investigating the desecration of a grave in Staffordshire have made another arrest.
The graveyard at Yoxall, scene of the desecration
A Wolverhampton woman, aged 24, was held on suspicion of conspiracy to blackmail on Tuesday. Four people already face similar charges.
The Hall family, who bred guinea pigs at a farm in Staffordshire, were subjected to a six-year campaign by animal rights protesters.
The remains of relative Gladys Hammond were taken from a graveyard in 2004.
The charges relate to the suspected blackmail of farm owners David Hall and Partners and others.
Ms Hammond was the mother-in-law of the farm's part-owner Christopher Hall.
The farm closed earlier this year as a result of the sustained campaign.
John Ablewhite, 35, of Hawley Street, Manchester, John Smith, 38, of Leicester Road, Wolverhampton, Kerry Whitburn, 36 of Summer Road, Birmingham and Josephine Mayo, 37, of Cottage Close, Chasetown, Staffordshire all face charges of conspiracy to blackmail.
They are due to appear at Nottingham Crown Court on 6 March.
A 63-year-old woman from Burton-on-Trent who was arrested in December has been released without charge.