Google has released more details about 12 accidents involving its self-driving cars as part of its commitment to monthly updates. The accidents were all minor with no reported injuries. While Google says its self-driving technology was not to blame, one accident involved an employee running an errand in self-driving mode and rear-ending another stopped car. Consumer groups are pushing Google to release official accident reports, which Google and California authorities have refused due to privacy concerns. Google testing of the cars began in 2009 with the first accident in 2010, and the cars have driven over 1 million autonomous miles.