SAN LUIS OBISPO, Calif. (AP) — Residents of California’s San Luis Obispo County received a series of unsettling erroneous emergency alerts as repairs were being made to a nuclear power plant’s siren system.

Emergency services manager Ron Alsop says a siren at the Diablo Canyon nuclear plant began wailing Friday afternoon for no apparent reason. Crews had upgraded the siren earlier in the day as part of a revamp of the emergency system.

County officials issued an alert message indicating there was no emergency, but that unknowingly sent a vague alert to cellphones in the area with a special tone and a message that there was a “civil emergency” and people should “prepare for action.”

When county officials realized the gaffe, they issued a final message stating that there was no cause for alarm.

(TM and © Copyright 2014 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2014 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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