Police investigating disappearance of Mary Duncan search the grounds of Helensburgh property
Detectives investigating the disappearance of a young mother more than 40 years ago are extending their search to a residential area in West Dunbartonshire.
Mary Duncan was 17 years old when she disappeared from her home in Alexandria in 1976.
The teenager, who had a 13-month-old daughter, vanished after telling her family she was going to meet a friend.
Her daughter later died of natural causes.
No trace of Mary has ever been found despite extensive inquiries.
On August 17, police announced they were searching a number of sites at the Vale of Leven Hospital in Alexandria.
Detectives have extended the search to include a residential site in Helensburgh, which will commence on Monday.
Detective Superintendent Calum Young, from West Dunbartonshire CID, said: "This latest development is due to extensive enquiries carried out in an attempt to find any indication of where Mary could be.
Mary Duncan was 17 years old when she disappeared from her home in Alexandria in 1976.
The teenager, who had a 13-month-old daughter, vanished after telling her family she was going to meet a friend.
Her daughter later died of natural causes.
No trace of Mary has ever been found despite extensive inquiries.
On August 17, police announced they were searching a number of sites at the Vale of Leven Hospital in Alexandria.
Detectives have extended the search to include a residential site in Helensburgh, which will commence on Monday.
Detective Superintendent Calum Young, from West Dunbartonshire CID, said: "This latest development is due to extensive enquiries carried out in an attempt to find any indication of where Mary could be.