![san-francisco-ups-shooting.jpg](https://assets2.cbsnewsstatic.com/hub/i/r/2017/06/16/cfcc848a-cef9-4437-9d0b-d8f32d6b2996/thumbnail/640x360/599ecc563ffc47143b13dcfce21d1518/san-francisco-ups-shooting.jpg?v=a23cb4bdf4fa7f3cb72e5118085577f9#)
Friends And Police At Loss To Find Reason For UPS Shooting
Friends and investigators were at a loss Thursday to explain what drove a San Francisco UPS driver to pull out a gun at a work meeting and kill three colleagues who police suspect were targeted.