Anti-Semitic and racist graffiti were found in Downtown Pittsburgh over the weekend on the Riverwalk near the 10th Street Bypass.
Vandals spray painted offensive messages on several walls and defaced murals.
Some of the graffiti mentions the Order of the Black Sun, a neo-Nazi network based in Florida.
The NAACP of Pittsburgh says it is aware of the graffiti and will release a statement Monday.
Photos were sent to Colin Dunlap of men holding white nationalist flags over the weekend.
He posted them on his "X" account.