Wan Ryung Song's arrest on Wednesday comes a day after the threat sparked street closures around the Wilshire Boulevard Temple in Koreatown as the bomb squad searched for explosives.
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The synagogue – which is the oldest in Los Angeles – was empty at the time of the threat. Residents of nearby apartments were evacuated.
Authorities said the 46-year-old Song called in the threats from public phone just blocks away.
Police suspect that he vandalized the temple with graffiti of a Swastika and anti-Semitic comments on December 6.
He was scheduled to be arraigned Thursday.
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