The sister of missing mum-of-two Nicola Bulley has reacted to a police theory that she “fell in the river” close to where she vanished. The search for Nicola, 45, is now entering its eighth day after the mortgage adviser disappeared on January 27 while she was walking her dog by the River Wyre in St Michael’s, Lancashire. Nicola’s dog was found running loose in the area shortly afterwards along with her phone, which was placed on a bench and connected to a work conference call. But despite an extensive search by police along with members of the local community, no other trace of her has been found. Lancashire Police said this week its “main working hypothesis” was that she fell into the River Wyre and that the incident is “not suspicious but a tragic case of a missing person”. Supt Sally Riley said police had looked through dashcam, CCTV and doorbell footage which had allowed detectives to "eliminate any trace so far of Nicola having left the riverside". But Nicola’s sister Louise Cunningham has now reacted to the theory on Facebook, saying “there is no evidence whatsoever to suggest that she has gone into the river”. In a public post, Louise said: “It’s just a theory. Everyone needs to keep an open mind as not all CCTV leads have been investigated fully.” Louise added that police had said the case “is far from over”. But Supt Riley emphasised it was important to reiterate the force believed there was no third party or criminal involvement as “speculation can be really distressing for the family and Nicola’s children”. Nicola Bulley is a mum-of-two who lives with her family in Inskip, a ten minute drive from where she went missing in St Michael’s, Lancashire. She is 45-years-old, originally from Chelmsford, Essex and works as a mortgage adviser for Exclusively Mortgages. Police said Nicola speaks with an Essex accent. She is described as white and 5ft 3ins tall, with light brown, shoulder-length hair. At the time of her disappearance, Nicola was wearing a long black gilet jacket, black jeans and olive green ankle wellington boots.