After a dead 15-year-old was found in Salzgitter, two young people are considered urgent suspects.
The public prosecutor's office in Braunschweig announced on Wednesday that it was a 13-year-old and a 14-year-old.
"We assume a homicide," said the spokesman for the Braunschweig public prosecutor's office, Hans Christian Wolters.
An arrest warrant for murder had been requested against the 14-year-old.
According to the authorities, the 13-year-old, who has not yet reached the age of criminal responsibility, cannot be imprisoned, so the youth welfare office was involved in his case.
The motive for the act has not yet been finally clarified, but is "in the personal sphere".
The public prosecutor's office did not initially provide any further information.
Officials discovered the young woman's body on Tuesday during an intensive search operation in a green area in the Fredenberg district.
The red-haired student was last seen in jeans and sneakers.
Her parents reported her missing Sunday night.
On Tuesday morning, the investigators published a description of the teenager and intensified the search in the Salzgitter-Fredenberg district.
Several roads were closed as a result.
The officials in Salzgitter had been supported by forces from the Central Police Headquarters in Hanover and the service dog squadron.