California serial killer appears to be ‘on a mission’, as police link seven shootings

Ballistics tests tie together fatal shooting in Oakland with killings of five men and the non-fatal shooting of a woman in Stockton

A California serial killer seems to be on a mission" dating back to last year, which has seen the fatal shooting of at least six men and the wounding of one woman - but authorities have not figured out what's behind the violence.

Ballistics tests and some video evidence linked the shootings in Stockton and Oakland, about 70 miles apart in northern California, police said.