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A CCTV image of a 76-year-old, taken just before she went missing from a hospital, has been released.
Police issued the picture as the search for Sheila Ratcliffe, who went missing from the William Harvey Hospital in Ashford, entered its fourth day.
She was last seen at 6.20pm on Saturday, being spotted around the Kennington Road area.
The police have also released a new line of inquiry, saying: "Officers have asked for motorists to check their dashcam footage for Sheila Ratcliffe if they were travelling on the M20 at J10 towards Bad Munstereifel Road, towards the Ashford International train station or around the William Harvey Hospital and Kennington Road heading into Ashford, via Hythe Road between 8.30pm on 1 August and 9pm on 2 August.
"Officers also believe it is possible that Mrs Ratcliffe may have taken shelter in outbuildings in this area and asked that residents check any such buildings for her.
"She is also believed to have lost her mobile phone in the area and have asked residents to hand any phone they may find into the police."
The police are concerned for her welfare, and ask anyone with information to contact them on 101 quoting 02-1280.