After the death of 14-year-old Josefine from Aschersleben in Saxony-Anhalt, an arrest warrant was issued against a peer on the basis of an urgent suspicion of manslaughter.
This was announced by the police and the public prosecutor in Magdeburg on Thursday.
The 14 suspect was taken to a youth institution after the Magdeburg district court issued the arrest warrant at the request of the public prosecutor.
A second 14-year-old boy was reportedly released for lack of suspicion.
Josefine was found dead in a garage complex on Wednesday.
The investigators assumed a crime.
The youth had been missing since Thursday last week.
On that day, she had wanted to meet her ex-boyfriend to hand over personal items.
It initially remained unclear whether the German, who was urgently suspected of being a suspect, was an ex-boyfriend.
On Thursday, hundreds of people expressed their grief over the death of Josefine, who had been missing for a long time, at the wood market in Aschersleben - a town with almost 27,000 inhabitants.
They lit candles, laid down flowers and stuffed animals.
In one framed letter it says: "You were torn from life far too soon." In another: "Forever best friends."
The police had secured traces in the find area until late Thursday night.
The area was cordoned off over a large area.
A special commission was then set up to deal with the case.