BART police officers push back a protester at the Civic Center station in San Francisco, Monday, Aug. 15, 2011. Cellphone service was operating as protesters gathered at a San Francisco subway station during rush-hour several days after transit officials shut wireless service to head off another demonstration. (AP Photo/Jeff Chiu)

Associated Press
BART police officers push back a protester at the Civic Center station in San Francisco, Monday, Aug. 15, 2011. Cellphone service was operating as protesters gathered at a San Francisco subway station during rush-hour several days after transit officials shut wireless service to head off another demonstration. (AP Photo/Jeff Chiu)
BART police officers push back a protester at the Civic Center station in San Francisco, Monday, Aug. 15, 2011. Cellphone service was operating as protesters gathered at a San Francisco subway station during rush-hour several days after transit officials shut wireless service to head off another demonstration. (AP Photo/Jeff Chiu)
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