As the search for missing Nicola Bulley continues, officers say it is possible she could have left the area by the only path not covered by CCTV.
Footage covers several pathways and fields near the area of the River Wye where Nicola was last seen on January 27 and officers have been trawling through CCTV.
Partner Paul Ansell met with police and dive expert Peter Faulding in the area on the 13th day of the search as the investigation goes on.
Police say it is a “possibility” Nicola left the area via the only path not covered by cameras but still believe she most likely fell in the deep waters of the river, the Mirror reports.
It comes as a close friend of Nicola's, Tilly Ann, urged officers to investigate a nearby abandoned house close to the river.
Posting on Facebook, she said: "The abandoned house and outbuildings etc have not yet been searched as it is not currently a crime investigation!"
In the latest update Lancashire Police said: “Our enquiries now focus on the river path which leads from the fields back to Garstang Road.
“For that we need drivers and cyclists who travelled that way on the morning of January 27 to make contact.
“We have already done a lot of work around this, but every piece of footage helps us build up a picture of movements on that morning.
“We will be making contact with drivers, who we believe were travelling down Garstang Road that morning via letter.
"If you receive one of these letters and have dashcam footage, we would urge you to make contact so that a member of the enquiry team can make contact and review your footage to establish whether it assists. We would ask that only drivers that do have dashcam footage reply to this request.
“Today we have been joined by a search team from Specialist Group International (SGI) who are assisting us with the search of the river, and we are grateful to them for their help.
“We are also grateful to all the members of the public who have come out to search and we would remind people not to put themselves at risk and to stick to public land.”
Mum-of-two Nicola, 45, disappeared on January 27 after dropping off her two children at school in St Michael's, Lancashire, before taking family dog Willow for a walk on a nearby trail.
The springer spaniel was found wandering nearby without her harness and Nicola's phone was later found on a bench.
Detective Supt Rebecca Smith added: “The team working on this investigation are completely dedicated and determined to find Nicola.
“As a mother myself, I can’t even begin to imagine what her two children are going through.
“Please be reassured our sole focus is Nicola and that we are doing everything we can to find her.
“It is not possible to provide every piece of information to the public because to do so would detract from the investigation, but I’d like to thank everyone who has assisted us so far and for the support provided to Nicola’s family at this extremely difficult time. They are being supported and updated throughout.”
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