(CNN) Tombstones and a Holocaust memorial in a Jewish cemetery outside Strasbourg, France, were vandalized with anti-Semitic graffiti earlier this week.

The vandalism was discovered Tuesday at the Herrlisheim Jewish cemetery hours before a gunman opened fire in Strasbourg's Christmas market, killing four people and wounding 13. Police killed the suspect Thursday evening, authorities said.

It's not known whether the vandalism and the attack were connected.

Thirty-seven tombstones were desecrated with spray-painted Nazi swastikas and other graffiti.

French Interior Minister Christophe Castaner, center, attends a ceremony at the Jewish cemetery of Herrlisheim with Strasbourg Rabbi Harold Weill, right, and Herrlisheim Mayor Louis Becker, second from right.

French Interior Minister Christophe Castaner attended a ceremony Friday at the cemetery and decried the vandalism.

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