Capitol Hill neighbors found what appears to be pro-Nazi graffiti on a bench in Lincoln Park on Tuesday. The words “Waffen SS,” referring to a wing of the Nazi SS organization that reported to Heinrich Himmler, were scrawled in black marker.

It’s unclear how long the graffiti has been on the bench, but a neighbor posted a photo of it recently in the Hill East NextDoor group, says Rachel Feinstein, a neighborhood resident and a member of the local social network. Feinstein says the post went up on Tuesday, but it prompted what she thought was surprisingly little discussion.

“This is the equivalent to me of someone writing ‘KKK’ on a bench.” Feinstein says. “Maybe people just don’t know what this is.”

She went to the park herself to see it in person. Feinstein found it on one of the benches surrounding the statue of Abraham Lincoln that gives the Capitol Hill park its name.

She has since reported it to the National Park Service, which manages Lincoln Park. After the report on Tuesday, NPS removed the slat on the bench with the graffiti mark and replaced it with a new one. The bench is now available for public use, according to an NPS spokesperson.

Feinstein, who is Jewish, says that the discovery shocked her and made her feel less safe in her neighborhood. “I was shocked and disgusted that this could happen four blocks from where I live,” she says. “I lived in Pittsburgh…and I was deeply affected by what happened in Squirrel Hill. This felt like another punch to the gut. And I felt compelled to see it for myself because it was so close.”

She suspects that people aren’t as outraged about the discovery as they would be if it were an image of a swastika–perhaps because the reference to the Waffen SS is relatively more obscure.

“I think the person who wrote this was hoping for it to be some kind of inside joke among other people who know what it is and share their views,” she says.

This isn’t the first time in recent years that pro-Nazi graffiti has appeared in the District: In just the last two years, swastikas were found carved and painted in elevators at Georgetown’s campus, more swastikas were found painted in a campus bathroom, anti-Semitic graffiti was sprayed on a building near Georgetown, and anti-Semitic symbols appeared at least five times at a large intersection in Chinatown, among other incidents.

Earlier this year, Bloomingdale residents discovered two brothers living in the neighborhood were avowed Neo-Nazis after one of them was arrested for gun charges.