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, yesterday, West Mercia Police said.
He has been named locally as Jamie Reynolds, 22, and is thought to be a friend of Ms Williams.
Detectives said Georgia has still not been found, and again appealed for any information as to her whereabouts.
Georgia was last seen by her family when she left home at 7.30pm on Sunday, telling them she was going out to see friends.
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.
"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."
Georgia was reported missing when it became clear that friends had not been in touch with her for days. She had missed her first driving lesson and a concert she had planned to go to with her boyfriend.
The teenager had been making frequent texts and making calls from her mobile phone until about 8pm on Sunday. That morning she reportedly tweeted: “Worst night’s sleep in ages. Need sleep. Stuff on mind. Now can’t get back to sleep.” Police are uncertain if it is relevant to their enquiry.
Friends joined the hunt for the missing girl, tweeting appeals for her to come home and for sightings to be reported. One tweeted: “been walking around for two hours looking for you, absolutely drenched, please just let somebody know you’re safe.”
The man, also from Wellington, was arrested by officers from West Mercia Police and Warwickshire Police after he was returned to Telford from Scotland last night.
Georgia was last seen on Sunday evening at about 7.30pm by her parents.
Her father is a serving detective with West Mercia Police.
Police said the last text messages and calls from her mobile phone were made at about 8pm on Sunday.
Supt Malik told a press conference yesterday Georgia's disappearance was "completely out of character" for the bright girl, who had been studying at college.
He added she had been due to take her first driving lesson this week and had missed a rendezvous to go and see a music concert with her boyfriend