One day after a 17-year-old burst into his former school and opened fire, killing nine students and three teachers, one very big question remains: why did he do it?
For investigators on the case, one thing has stood out: the majority of the victims were female. All but one of the nine students, aged between 14 and 16, were girls, and the three teachers gunned down were all women.
Heribert Rech, interior minister of the German state of Baden-Wuerttemberg, where the crime was committed, said he didn't want to draw conclusions, telling journalists that could have been based on how the classes were drawn up.
However, Rech did admit that the fact that most of the victims were killed with a shot to the head indicated that they were not random targets.
Portrait of a killer
The perpetrator, identified only as Tim K., was described by school officials as being an unremarkable student.
He had achieved average marks on his school leaving certificate and had then enrolled in a course to become a salesman. Tim K. also regularly worked out at the gym and belonged to a sports club.
However, a 19-year-old neighbor, who identified himself as Michael and said he used to play table tennis with the gunman, told the Reuters news agency that Tim K. was a loner who had a big collection of horror films.
Germany has strict gun control laws. Yet police say the gunman had used a nine millimeter pistol registered to his father, a member of a gun club who has a collection of 15 guns at home.
Emergency plans in place
After a school shooting in Germany in 2002, many schools have implemented plans laying out what to do in the event that a gunman should attack the school.
Authorities are reporting that once the gunman entered the school, the principal announced a coded message on the public address system, saying, "Frau Koma is coming."
One student, identified only as Kim S., told ZDF television that their teacher shut the door and told them to close the windows and sit on the floor.
Focus on prevention
In addition to finding the motive of the killer, many in Germany are wondering how these types of attacks can be prevented in the future.
Wilhelm Heitmeyer, a sociologist who specializes in school violence, told Deutsche Welle that the best people to identify a potential attacker are fellow students.
"We see that a lot of the perpetrators are very isolated and they speak out about violent acts," he says, "And it's the peers, and not the teachers, who are going to notice this the most."
Heitmeyer warns, however, that what actually triggers these people to finally act out is a mystery. Talking about these attacks more openly with students of all ages is the best way to prevent them in the future, he says.