BOISE, Idaho (AP) — A third incident of racist and anti-Semitic vandalism has been found at the Anne Frank Human Right Memorial in Idaho, but authorities are not sure if it is new or part of vandalism found earlier this week.

The Idaho Statesman reports that offensive writing on a sign at the memorial was found early Thursday morning, as well as on a nearby tunnel. This came after officials found racist and anti-Semitic vandalism at the memorial on Tuesday and then a swastika drawing on Wednesday.

The Wassmuth Center for Human Rights is raising money to replace the vandalized tablets, which were damaged during efforts to clean the graffiti tags off them. A Boise Police Department spokeswoman says a detective has been assigned to the case but no has no leads or suspects. The memorial in Boise had been dedicated in 2002.