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Updated Aug. 23 at 9:02 a.m. with comment from Santa Clara County Sheriff’s Office.

Congregation Beth Am in Los Altos Hills has experienced a series of bomb threats and other emailed threats since December, synagogue leadership said, including one on Saturday.

The Reform synagogue emailed its congregants the next day to assure them the synagogue was safe and back to normal operations.

The threatening email was disseminated to many synagogues all at once, according to an email co-signed by Beth Am president Amy Gerstein, interim Senior Rabbi Art Nemitoff and executive director Jeremy Ragent.

“We are writing with the unhappy news that yesterday Beth Am was included in yet another mass email synagogue bomb threat. We have officially issued the ‘all clear,’” they wrote.

The bomb threat was reported to Santa Clara County police shortly before 10 a.m. Saturday. Sheriff’s deputies and a bomb-sniffing dog searched the synagogue campus that morning and early afternoon, according to Brooks Jarosz, senior communications officer for the sheriff’s office.

“Nothing was found and the threat was determined to not be credible,” Jarosz wrote in an email to J.

This was the fourth time in eight months that Beth Am has experienced such a scare, according to administrators.

Last December, it was part of a wave of “swatting” incidents and false bomb threats that hit more than 200 Jewish congregations and institutions across the country. Swatting incidents are hoaxes designed to send heavily armed police to a target location.

“These moments are scary, by design,” the synagogue leaders wrote in their email.

Because the threat closely resembled the nonspecific mass emails that included Beth Am last December, January and May, the Santa Clara County Sheriff’s Office determined that the threat was not credible, they added.

“At the same time, knowing that our home was the target of even a non-credible threat and harassment can bring up a host of negative emotions and concerns,” the message to congregants said. “Our staff and clergy are here to discuss these feelings with you whenever you need.”