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1st March 2023
04:07pm GMT
A search and rescue team works through a woodland area as they continue to search for the missing baby on March 01, 2023 in Brighton (Getty)[/caption]
Marten and Gordon were arrested on Monday in Stanmer Villas on suspicion of child neglect, after a member of the public reported seeing them shortly before 9.30 pm that day.
The couple was on the run for 7 weeks.
But the newborn has yet to be found and has not received any medical treatment since they were born.
Over 200 officers are searching a 91-square-mile area across East Sussex - with the focus on Stanmer Villas and Roedale Valley Allotments area of Brighton.
As concern for the baby's welfare grew, police confirmed on Tuesday that Marten and Gordon had been further arrested on suspicion of gross negligence manslaughter.
[caption id="attachment_380045" align="alignnone" width="2048"]
Roedale Valley Allotments has become one of the focus areas of the 91-square mile search (Getty)[/caption]
Detective Superintendent Lewis Basford, from the Metropolitan Police, said the risk to the infant was increasing as time goes on.
Police said they still hope to find the baby safe and well, but DS Basford added that they must "be open to the fact this may not end in the way we would like" and that the infant may have "come to harm.
Marten, 35, and Gordon, 48, had been travelling around the UK by taxi since their car was found burning on the M61 in Bolton, Greater Manchester, on 5 January. The couple walked along the hard shoulder of the motorway, with Marten carrying their baby in her arms.
Authorities previously believed the couple had been sleeping rough, and had been dodging police by moving around frequently and keeping their faces covered from CCTV. The couple travelled from Bolton to Liverpool, then to Harwich in Essex, then to east London and then to Newhaven in Sussex, where they were seen near the ferry port on 8 January.
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