Police searching for missing teenager Jayden Parkinson are focussing their investigation on a churchyard grave.
Thames Valley Police said that the hunt for Jayden had led them to the grounds of All Saints' Church in Didcot, Oxfordshire.
The 17-year-old girl disappeared on December 3 after she was last seen leaving the town's railway station at about 4.30pm.
A spokeswoman said that officers were acting on a tip-off received this afternoon and had liaised with the family of the person buried in the grave.
Detective Chief Superintendent Andy Murray, who is leading the investigation, said: "This afternoon we received some significant and highly relevant information which leads us to concentrate our search efforts in the Great Western Cemetery and a specific grave within the cemetery.
"We're in the process of securing this grave and would like to emphasise that the family connected with this grave have been informed.
"We will be here throughout the night and for a number of days.
"A tent has been erected which covers more than the specific grave we are focusing on.
"The families of those in the graves nearby will be contacted by us and reassured that there will be no disturbance to these graves.
We would ask people not to be concerned, as families who need to be aware will be contacted and reassured by us.
"The investigation could take some time and is a very sensitive and difficult situation so we would like to ask the public and the media to be patient and understanding at this time."