Detectives say the mother's disappearance was graded as high risk due to "specific vulnerabilities".
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'Nicola Bulley was considered a high-risk missing person from the start of the investigation into her disappearance, police have said.
The 45-year-old went missing on 27 January during a riverside dog walk in St Michael's on Wyre in Lancashire.
Det Supt Rebecca Smith said she was listed as high risk because of a "number of specific vulnerabilities".
But she added this was "normal in a missing person investigation with the information we were in possession of".
According to the College of Policing, the category is applied when the risk of a person coming to serious harm is assessed as very likely.'