Oakland police officers work to extinguish a fire during a protest early on Sunday, July 14, 2013, in Oakland, Calif., after George Zimmerman was found not guilty in the 2012 shooting death of teenager Trayvon Martin. (AP Photo/Bay Area News Group, Anda Chu)

Photo by: Anda Chu

Oakland police officers work to extinguish a fire during a protest early on Sunday, July 14, 2013, in Oakland, Calif., after George Zimmerman was found not guilty in the 2012 shooting death of teenager Trayvon Martin. (AP Photo/Bay Area News Group, Anda Chu)