Durham Constabulary said on Saturday that police officers and mountain rescue teams had focused their search in Hamsterley Forest and the surrounding areas, where there are a number of running trails.
Chief Inspector Dean Haythornthwaite, of Durham Constabulary, previously said: “We have become increasingly concerned for Jenny since she was reported missing on Tuesday and have been exploring all lines of inquiry.”.
Digital intelligence officers have checked Ms Hall’s mobile phone, smartwatch and running apps, but have found no leads.
Jenny Hall, 23, was last seen leaving her home in Tow Law, County Durham, just after 3pm on Tuesday.
Ms Hall is described as being white, 6ft tall with dark brown hair, which may have been tied in a ponytail.
