This prospect has caused anxiety on campus, with some students reported to be walking home in pairs.
Yesterday, the university acknowledged students may be “feeling worried” about last week’s developments and advised them that support staff were available if needed.
Chief Superintendent Phil Ward said on Wednesday: “While the investigation has been treated as a missing person inquiry, we continue to keep an open mind as to the circumstances surrounding Libby’s disappearance.
“We have had specialist officers, detectives and specialist teams carrying out numerous actions and enquiries, searches and following up leads since the report of Libby’s disappearance in the early hours of Friday, February 1.
“While her location is not yet known, this does not automatically mean she has come to any harm, but we must carry out a thorough investigation and explore all possibilities.”