Winnenden, Germany - Police said Monday they had launched a criminal investigation into the father of a teenager who went on a killing spree at school in south-west Germany last week.
Investigators were trying to determine whether the man should answer charges of causing death through negligence, a police spokeswoman told Deutsche Presse-Agentur dpa.
The father of gunman Thomas Kretschmer, 17, has been described as a passionate marksman who kept 15 weapons and 4,600 rounds of ammunition at his home.