From BBC:
The 17-year-old gunman walked into technical school Albertville-Realschule in Winnenden at 0930 local time (0830 GMT) on Wednesday.
Dressed in black, he started firing at random, killing nine students and three teachers.
At 0933, police received a emergency call and sent two response teams. They found the victims' bodies in two classrooms.
As the police arrived, the gunman fled. He passed a psychiatric clinic near the school and shot dead someone else.
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More News On Today's Shooting Spree In Germany
Teen gunman dead after killing 16 in Germany -- AP
Police slay teen gunman who killed 15 in Germany -- Yahoo News/AP
Teenage gunman attacks German school, kills 15 -- Yahoo News/Reuters
German school gunman kills 15 -- Yahoo news/AFP
German school massacre gunman dies in police shootout after chase -- Times Online
Gunman dead after German school shooting spree -- Reuters
17 Dead After Shooting Spree in Germany -- Washington Post
Teen gunman kills 16 in German shooting spree -- CNN
At Least 16 Killed in School Shooting in Germany -- New York Times
German school shooting: Timeline of past attacks -- The Telegraph