FREMONT (CBS SF) — Worker arriving for a monthly cleaning of Fremont’s Temple Beth Torah synagogue discovered a swastika etched into the wall of the structure.

The synagogue has been shut down during the COVID-19 outbreak, forcing officials to conduct services remotely so the maintenance worker only visits the facility every other month.

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In an email to members, synagogue officials said the swastika appeared to have been drawn in black marker or thick pen onto a stucco wall. It measured about 5 square inches.

Fremont police were investigating and asked neighbors to check their security cameras to see if they captured images of the vandal.

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“It’s disturbing,” Temple administrator Jill Ziman told the Jewish News of Northern California website . “It’s sad that this still happens.”

Ro Khanna, who represents California’s 17th District including Fremont, in the Congress took to Twitter on Thursday to condemn the act of vandalism.

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“It is sad and outrageous to have this act of antisemitism in my hometown of Fremont where a synagogue was defaced with a swastika,” he posted. “The perpetrators of this hate crime must be held accountable. I stand with the impacted community during this difficult time.”