SAN FRANCISCO (CBS SF) — Emergency sirens were switched back online Sunday while authorities work to determine the cause of activations that were accidentally sounded late Saturday and early Sunday morning, according to the San Francisco Department of Emergency Management.

Alarms went off around 11 p.m. Saturday in the Bernal Heights, Noe Valley and Hunters Point neighborhoods, the Bayview District, City Hall, and other areas, but there was no known emergency that would have triggered the alarms, department spokesman Francis Zamora said.

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Alarms around the city were sounded again around 5 a.m., he said.  Calls flooded emergency dispatchers.

“Numerous calls, 911, 311.  People concerned about her, why are these sirens going off?” Zamora said.

There may be possible the alarms will go off again during the testing, according to Zamora.

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In the event of a real emergency during the deactivation, the city will utilize its text and email alert system that people can register for at http://www.alertsf.org.

The city will also post information on an emergency through its social media accounts on Facebook at http://www.facebook.com/SFDEM and http://www.facebook.com/sf72org.

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