Athens Mayor Giorgos Kaminis has signed a declaration against anti-Semitism, JTA reports.

The American Jewish Committee has been encouraging city mayors to sign the document and show their opposition to continuing anti-Semitic incidents. So far, over 300 mayors in the United States and 60 in Europe have added their name to the Mayors United Against Anti-Semitism campaign.

“I chose to sign because it is my conviction that the first value in civilized society is human dignity,” said Kaminis.

Over the past year, the Jewish cemetery in Athens has been vandalized, as have a number of memorials to the Holocaust. A government minister was even revealed to have accused Jews of masterminding the 9/11 attacks last September.

A survey by the Anti-Defamation League recently found that Greece has the highest rate of anti-Semitic beliefs in Europe, at 69 percent of the population. The next highest rate was in France, where 37 percent have anti-Semitic attitudes.