Israel on Wednesday began commemorating its Holocaust Remembrance Day in honor of the 6 million Jews killed by the Nazis, as leaders voiced concerns about a rising wave of anti-Semitism around the world.

In emotional addresses to an opening ceremony at Israel's national Holocaust memorial, the country's ceremonial president warned the government against getting too close to far right parties in Europe, while Prime Minister Benjamin Netanyahu said that last weekend's deadly synagogue shooting in San Diego was the latest reminder of growing anti-Semitic hatred.

The 24-hour remembrance period began at sundown with the main ceremony at Jerusalem's Yad Vashem Holocaust memorial, and came just hours after Israeli researchers reported that violent attacks against Jews rose significantly last year. This spike, highlighted by the San Diego attack, was most dramatic in western Europe.