In this April 2, 2012 file photo, Oakland police work after a school shooting at Oikos University in Oakland, Calif., Monday, April 2, 2012. Minutes after the shooting near the Oakland

 

              In this April 2, 2012 file photo, Oakland police work after a school shooting at Oikos University in Oakland, Calif., Monday, April 2, 2012. Minutes after the shooting near the Oakland
In this April 2, 2012 file photo, Oakland police work after a school shooting at Oikos University in Oakland, Calif., Monday, April 2, 2012. Minutes after the shooting near the Oakland Airport and the supposed gunman on the lam, police Sgt. Chris Bolton used social media site Nixle to text a flurry of alerts to thousands through an emerging social media notification provider. “Stay out of area,” one alert said. “Multiple shooting victims reported. Medical on-scene. Police are evacuating a nearby, affected business.” (AP Photo/Noah Berger, File)