The daughter of an elderly couple found buried in the back garden of their home has been arrested on suspicion of their murder.
Susan Edwards, 55, and her husband Christopher, 57, were arrested at St Pancras International railway station in London on Wednesday evening.
Nottinghamshire Police have refused to confirm the identities of the pair under arrest, but it is understood that they are the daughter of William and Patricia Wycherley and her husband.
The couple, who are believed to have been living outside the UK, remain in police custody and are continuing to be questioned on suspicion of murder.
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The arrests follow the discovery of human remains buried in the back garden of a house in Blenheim Close, Forest Town in Mansfield, Nottinghamshire, last month.
The remains are believed to be of Mr and Mrs Wycherley, who moved into the address in 1987 and, according to neighbours, disappeared in 1998.
Mrs Edwards and her husband have been arrested on suspicion of murdering the couple in 1998.
A murder inquiry was launched after the bodies were unearthed in the back garden of the semi-detached house following a tip-off to the police.
Nottinghamshire Police said that while formal identification has yet to be confirmed, officers believe the remains are those of Mr and Mrs Wycherley.
Officers have said Mrs Wycherley is believed to have been born in Fulham, west London, and would now have been 79. Her husband would have been 100.
Nottinghamshire Police said results from bone analysis have shed further light on the remains.
One of the bodies is believed by experts to be that of an elderly white man who was older than 60, well-built and around 5ft 8in.
The second set of remains is likely to be that of a well-built white woman, who was 40 or older and around 5ft 6in.
Although the cause of death has yet to be determined in both cases, the female remains have a "distinctive feature in their anatomy".
Detective Chief Inspector Rob Griffin, who is leading the inquiry, previously said the findings support the theory that the remains are those of the Wycherleys.
He said: "Bill and Pat, who would be 100 and 79 respectively if they were to still be alive today, were known to be quite reclusive.
"But with help from relatives and old friends, we are starting to build a picture of their lives and, more importantly, their movements in 1998, when neighbours say they simply disappeared."