Munich gunman 'spent a year planning rampage'

The teenager behind the deadly shooting rampage at a Munich mall had planned his attack for a year and chose his victims at random, investigators said.

Bavarian investigator Robert Heimberger said the gunman, an 18-year-old German-Iranian identified only as David S but named in media reports as Ali Sonboly, visited the site of a previous school shooting in the German town of Winnenden and took photographs last year.