DUBLIN — The cause of a recent technical glitch that kept dozens of law enforcement agencies across the East Bay from hiding their radio communications from the public remains a mystery, authorities said Friday morning.

No timeline exists for when police departments and sheriff’s offices across Alameda and Contra Costa counties will end public access to their radio feeds, because they don’t know why the system didn’t work this week as planned, said David Swing, the head of the East Bay Regional Communications System Authority. The former Pleasanton police chief spoke during a board meeting Friday for the entity, adding that technicians planned to conduct tests in Martinez on a backup radio channel to try to root out the issue.

“Based on what I’m seeing, it’s difficult to explain, because

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