The ex-partner of 17-year-old Jayden Parkinson has appeared in court accused of murdering the teenager and disposing of her body.
Ben Blakeley, 22, and a youth who cannot be named for legal reasons, were both remanded in custody after making separate appearances at Oxford Magistrates' Court in connection with Jayden's disappearance.
Blakeley is alleged to have murdered Jayden and to have perverted the course of public justice by disposing of her body and lying to the police about the last time he saw her alive.
The 17-year-old is accused of perverting the course of justice between December 3 and December 10 by assisting in the disposal of Jayden's body and other evidence.
Blakeley, of Christchurch Road, Reading, was ordered to reappear at Oxford Crown Court tomorrow, when the youth will be brought before a special sitting of the city's youth court.
Jayden, who was living in Oxford, was last seen two weeks ago at Didcot railway station.
Extensive searches by Thames Valley Police have so far failed to locate the teenager, who is thought to have travelled from Oxford to Didcot on the afternoon of December 3.
Specialist search teams backed by helicopters and police dogs have been attempting to locate Jayden, who was last seen at about 4.30pm on December 3.
Throughout the weekend, police continued a detailed search of an area of farmland just outside the village of Upton, near Didcot.
Commenting on the continuing searches, Detective Chief Superintendent Andy Murray said: "We now have a number of locations where police activity is taking place, mainly in the Didcot and Upton area.
"All of this activity will understandably disrupt and worry the local community.
"Our priority is to find Jayden, and as you can imagine with all of the media attention, we have received a lot of useful information which has led us to focus our attention on these areas.
"The public is asked to be patient and, as we said yesterday, to refrain from carrying out their own searches as it could jeopardise police work."
Thanking the media and the public for their help during the inquiry so far, Mr Murray added: "We are doing everything we can, working tirelessly round the clock, to find where Jayden is."