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UNIVERSITY CITY, MO - FEBRUARY 22: Volunteers from a local monument company help to reset vandalized headstones at Chesed Shel Emeth Cemetery on February 22, 2017 in University City, Missouri. Since the beginning of the year, there has been a nationwide spike in incidents including bomb threats at Jewish community centers and reports of anti-semitic graffiti. (Photo: Michael Thomas/ Getty Images)

UNIVERSITY CITY, MO - FEBRUARY 22: Volunteers from a local monument company help to reset vandalized headstones at Chesed Shel Emeth Cemetery on February 22, 2017 in University City, Missouri. Since the beginning of the year, there has been a nationwide spike in incidents including bomb threats at Jewish community centers and reports of anti-semitic graffiti. (Photo: Michael Thomas/ Getty Images)