A college student was killed on a bus in San Francisco . DA : ` That 's just people 's stupidity , I guess , ignorance of what 's happening around them , '' said Whitney Bulmer . The student waved his gun around and showed it before the shooting . Nobody noticed the gun before the shooting , DA said .
A college student was killed on a bus in San Francisco . DA : The student waved his gun around and showed it before the shooting . Nobody noticed the gun before the shooting , DA said .