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Police have released a new image of a missing woman as the search continues.
Barbara Hall, 71, was seen in the Aldgate area of the capital on Tuesday morning and is believed to have travelled to Gravesend Railway Station the same day.
Officers understand she was last seen walking in the direction of Barrack Row and Garrick Street at around 12.45pm.
It is thought she may have since travelled to Dartford.
Mrs Hall is 5ft 4 of slim build with brown hair
She often uses a pink walking stick and was last seen wearing a pink hooded coat, brown trousers, brown shoes and pink gloves. She also carries a zebra striped handbag.
Anyone with information is asked to call Kent Police on 101 quoting 19-0001.