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A statement posted on the transit agency's website said the communications blackout was ordered in the interest of public safety:

"Organizers planning to disrupt BART service on August 11, 2011 stated they would use mobile devices to coordinate their disruptive activities and communicate about the location and number of BART Police," the statement reads.

"A civil disturbance during commute times at busy downtown San Francisco stations could lead to platform overcrowding and unsafe conditions for BART customers, employees and demonstrators. BART temporarily interrupted service at select BART stations as one of many tactics to ensure the safety of everyone on the platform."

BART did not immediately offer details of how the shutdown took place, how long it lasted or what stations were affected.