Detectives investigating the disappearance and possible murder of a young mother who has been missing for 14 years have received potentially "crucial information" from a caller.
The new lead came as exhumations of graves in Ruiton Cemetery in Upper Gornal, near Dudley, marked the latest attempt to trace Natalie Putt, who was last seen in 2003.
Detective Inspector Ian Iliffe, of West Midlands Police, said: "We have received a phone call from a man in a telephone box in the Lake Street area of Gornal with specific information that has the potential to lead to the person responsible for Natalie's death.
"This crucial information could help us solve this mystery and give Natalie's family the answers they need.
"I would urge that person to contact us again and we will ensure the information they have is treated with the strictest confidentiality."
Miss Putt was 17 when she left her home in Thornleigh, Lower Gornal, to go to a local shop in September 2003.
She was never seen again and left behind her baby son, who was just 11 weeks old.
An 18-year-old local man was arrested in March 2004 in connection with Natalie's disappearance, but was later released without charge.
Officers have previously searched open land near to the teenager's home, including underwater searches of rivers and lakes, and farmland in Wombourne, where it is understood she kept horses, but no clue has been found to help uncover what happened to Natalie.
Mr Iliffe had earlier pointed out that all cases are periodically reviewed and "the disappearance of Natalie has led us to believe that we are looking at a murder inquiry".
He said: "We have had no positive sightings of Natalie in all these years and there has never been any financial activity connected to her bank accounts or any access to health services across the country, which points to the fact that she is no longer alive."
He said that police had been granted permission to exhume "a number" of graves in Ruiton Cemetery, adding: "We also believe that at least two people know what has led us to this site and they may have further information which could assist our search.
"We would very much like to hear from them."
In a statement to the media, the sisters of the missing teenager, Becky and Lowri, said: "To hear of the news and events regarding Natalie's disappearance is absolutely devastating to all of the family.
"We are obviously very upset about the developments and as such would ask that our family is left in peace until such time that we hear of definitive news from the police.
"In the near 14 years that Natalie has been missing, we have never given up hope of finding her safe and well. Until we know anything to the contrary, this remains the case."
Anyone with information to help the investigation is urged to call police on 101 or 0121 428 6092.
The Crimestoppers service can also be contacted anonymously on 0800 555 111.