The operators of the Bay Area Rapid Transit subway system temporarily shut down cell service last night in four downtown San Francisco stations to interfere with a protest over a shooting by a BART police officer, a spokesman for the system said today. "BART staff or contractors shut down power to the nodes and alerted the cell carriers," James Allison, deputy chief communications officer for BART, told CNET. The move was "one of many tactics to ensure the safety of everyone on the platform," he said in an initial statement provided to CNET earlier this afternoon. Activists had planned to...