Bay Area Rapid Transit officials are warning riders about a second protest condemning a man's fatal shooting by transit officers.
BART is alerting passengers on its Web site that protesters may disrupt service as early as Thursday in response to the shooting death of Charles Hill in San Francisco on July 3.
Organizers announced on the No Justice, No BART website that they planned to protest starting at 4:30 p.m. Thursday at the Civic Center BART station.
Muni also said in a release Thursday saying that as a precaution "regular Cable Car service on the Powell Street portion of the Powell-Mason and Powell-Hyde lines will not be in place."
Three San Francisco train stations were briefly closed during rush hour on July 11 as an estimated 100 protesters chanted and held doors open to keep trains from leaving. No arrests were reported.
Hill was shot in the torso by BART officers responding to reports of a "wobbly drunk" at the Civic Center/UN Plaza station in San Francisco. The officers claim Hill came at them with a knife.
The transit agency has been battling image problems after a white officer fatally shot an unarmed black passenger on New Year's Day 2009 at an Oakland train station.