At least one person struck the Oregon Holocaust Memorial in Southwest Portland’s Washington Park, scrawling swastikas across the memorial’s stone wall, city officials said.

The vandalism, written in white, also included the numbers “1488,” a symbol popular among neo-Nazis and other white supremacists, a photo reviewed by The Oregonian/OregonLive shows.

Police notified parks bureau staff of the anti-Semitic graffiti about 11 a.m. Sunday, said Mark Ross, a Portland Parks & Recreation spokesman.

Maintenance crews later managed to remove the graffiti, Ross said, adding that the vandalism remains under investigation by police.

The Portland Police Bureau did not respond to a request for comment Sunday night.

In 2016, someone painted a swastika on a statue of former Portland Mayor Vera Katz located on the city’s Eastbank Esplanade. Katz and her Jewish family had fled Nazi Germany when she was a child in the early 1930s.

The Oregon Holocaust Memorial was dedicated in 2004.

At the end of the memorial wall is a soil vault panel, where soil and ash are interred from six extermination camps of the Holocaust.

Engraved in the granite panels on the backside of the wall are the names of people who died in the camps, as well as their surviving relatives who live in Oregon and southwest Washington.