Police have been given more time to question a man over the murder of teenager Georgia Williams.
The 17-year-old has not been seen since last Sunday evening, when she told her parents she was going to meet friends.
Officers have been searching woodland for Georgia and have taped off an area in a nature reserve about 17 miles from her home in Wellington, Shropshire.
A police tent has also been put up at Brown Moss Nature Reserve, Shropshire, as part of the investigation.
The 22-year-old man from Wellington, named locally as Jamie Reynolds, was first arrested at a budget hotel in Glasgow in connection with the alleged kidnap of Georgia and was returned to Shropshire. Reynolds, a friend of Georgia, was then further arrested on suspicion of murder.
Superintendent Nav Malik, Telford and Wrekin police commander, said: "I make it very clear, folks, that we have not found Georgia Williams at this moment in time. She remains elsewhere - we are not quite sure where. We are really, really keen to identify where she may be, her whereabouts, and I urge the public to support us in trying to find out where she may be."
More than 50 detectives are working on the investigation. Mr Malik said police were still keen to trace the movements of a silver Toyota Hiace 300 GS van to which the man in custody had access and which was seized in Glasgow.
The van, which has the number plate CV06 ASV, is believed to have left Wellington at about noon on Monday, travelling to Oswestry, Rhyl, Chester and Kendal before reaching Glasgow at about midday on Tuesday. The Sun has published CCTV images which are thought to capture Reynolds getting out of a van in a car park close to the hotel, the day before his arrest. He is seen changing his shirt and spraying himself with deodorant.
Forensics teams have searched a semi-detached house in Wellington where neighbours said Reynolds lived with his parents.
Georgia's disappearance has been described by police as being "completely out of character". Detectives have been granted an extension until 6.30am Saturday to allow them to continue interviewing Reynolds.