A 22-year-old man has been arrested on suspicion of murdering teenager Georgia Williams who has been missing since Sunday.
The man was originally arrested in Glasgow on suspicion of kidnapping the 17-year-old, of Wellington, Shropshire.
Detectives said Georgia has still not been found, and again appealed for any information as to her whereabouts.
Police say they are "gravely concerned"
Telford and Wrekin commander Superintendent Nav Malik said: "The arrest of the suspect for murder follows developments in the investigation since yesterday afternoon but, for operational reasons and because we have someone in custody, I am not able to give any further details about that at this time.
"However, I would like to stress that Georgia Williams has still not been found and achieving that is still the primary focus of our investigation. Therefore, we still urgently want people to come forward and tell us if they have seen or had any contact with her since 7.30pm on Sunday when she left the family home.
"I would remind people that Georgia, who is white, 5ft 3ins, slim and with long, dyed red hair, was last seen wearing a waist-length black leather jacket over a white T-shirt which has a London bus motif on it. She was also wearing black, skinny jeans and flat, black suede slip-on shoes.
Officers are trying to piece together the movements of this Toyota van
"We also want to hear from anyone who may have seen a silver Toyota Hiace 300 GS panel van, registration CX06 ASV, which we know took a route from Wellington to Oswestry in Shropshire before moving on to Rhyl, Chester, Kendal in Cumbria, and then Glasgow.
"If you think you saw this vehicle either en route or parked somewhere between Sunday evening and when we recovered it in a car park in Glasgow city centre yesterday, then please let us know. The vehicle had ladders on the roof and we know it was driven by the suspect prior to his arrest.
"The smallest scrap of detail could be vital to our inquiries, so even if you think it may not be important, please tell us so that we can check it out."